Example usage of multiple suggestions
This commit is contained in:
Oliver Schneider
parent
67d762d896
commit
e2f781c7ea
15 changed files with 113 additions and 91 deletions
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@ -81,6 +81,10 @@ impl Emitter for EmitterWriter {
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/// maximum number of lines we will print for each error; arbitrary.
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pub const MAX_HIGHLIGHT_LINES: usize = 6;
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/// maximum number of suggestions to be shown
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///
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/// Arbitrary, but taken from trait import suggestion limit
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pub const MAX_SUGGESTIONS: usize = 4;
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#[derive(Clone, Copy, Debug, PartialEq, Eq)]
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pub enum ColorConfig {
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@ -1077,20 +1081,22 @@ impl EmitterWriter {
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assert!(!lines.lines.is_empty());
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for complete in suggestion.splice_lines(cm.borrow()) {
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buffer.append(0, &level.to_string(), Style::Level(level.clone()));
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buffer.append(0, ": ", Style::HeaderMsg);
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self.msg_to_buffer(&mut buffer,
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&[(suggestion.msg.to_owned(), Style::NoStyle)],
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max_line_num_len,
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"suggestion",
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Some(Style::HeaderMsg));
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buffer.append(0, &level.to_string(), Style::Level(level.clone()));
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buffer.append(0, ": ", Style::HeaderMsg);
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self.msg_to_buffer(&mut buffer,
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&[(suggestion.msg.to_owned(), Style::NoStyle)],
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max_line_num_len,
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"suggestion",
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Some(Style::HeaderMsg));
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let suggestions = suggestion.splice_lines(cm.borrow());
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let mut row_num = 1;
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for complete in suggestions.iter().take(MAX_SUGGESTIONS) {
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// print the suggestion without any line numbers, but leave
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// space for them. This helps with lining up with previous
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// snippets from the actual error being reported.
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let mut lines = complete.lines();
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let mut row_num = 1;
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for line in lines.by_ref().take(MAX_HIGHLIGHT_LINES) {
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draw_col_separator(&mut buffer, row_num, max_line_num_len + 1);
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buffer.append(row_num, line, Style::NoStyle);
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@ -1102,6 +1108,10 @@ impl EmitterWriter {
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buffer.append(row_num, "...", Style::NoStyle);
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}
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}
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if suggestions.len() > MAX_SUGGESTIONS {
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let msg = format!("and {} other candidates", suggestions.len() - MAX_SUGGESTIONS);
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buffer.append(row_num, &msg, Style::NoStyle);
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}
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emit_to_destination(&buffer.render(), level, &mut self.dst)?;
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}
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Ok(())
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@ -183,7 +183,10 @@ impl CodeSuggestion {
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prev_line = fm.get_line(prev_hi.line - 1);
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}
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for buf in &mut bufs {
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push_trailing(buf, prev_line, &prev_hi, None);
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// if the replacement already ends with a newline, don't print the next line
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if !buf.ends_with('\n') {
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push_trailing(buf, prev_line, &prev_hi, None);
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}
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// remove trailing newline
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buf.pop();
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}
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@ -150,7 +150,7 @@ impl<'a> Resolver<'a> {
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view_path.span,
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ResolutionError::SelfImportsOnlyAllowedWithin);
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} else if source_name == "$crate" && full_path.segments.len() == 1 {
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let crate_root = self.resolve_crate_var(source.ctxt);
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let crate_root = self.resolve_crate_var(source.ctxt, item.span);
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let crate_name = match crate_root.kind {
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ModuleKind::Def(_, name) => name,
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ModuleKind::Block(..) => unreachable!(),
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@ -247,7 +247,7 @@ impl<'a> Resolver<'a> {
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// n.b. we don't need to look at the path option here, because cstore already did
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let crate_id = self.session.cstore.extern_mod_stmt_cnum(item.id).unwrap();
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let module = self.get_extern_crate_root(crate_id);
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let module = self.get_extern_crate_root(crate_id, item.span);
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self.populate_module_if_necessary(module);
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let used = self.process_legacy_macro_imports(item, module, expansion);
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let binding =
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@ -279,7 +279,7 @@ impl<'a> Resolver<'a> {
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no_implicit_prelude: parent.no_implicit_prelude || {
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attr::contains_name(&item.attrs, "no_implicit_prelude")
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},
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..ModuleData::new(Some(parent), module_kind, def_id)
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..ModuleData::new(Some(parent), module_kind, def_id, item.span)
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});
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self.define(parent, ident, TypeNS, (module, vis, sp, expansion));
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self.module_map.insert(def_id, module);
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@ -314,7 +314,10 @@ impl<'a> Resolver<'a> {
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ItemKind::Enum(ref enum_definition, _) => {
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let def = Def::Enum(self.definitions.local_def_id(item.id));
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let module_kind = ModuleKind::Def(def, ident.name);
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let module = self.new_module(parent, module_kind, parent.normal_ancestor_id);
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let module = self.new_module(parent,
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module_kind,
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parent.normal_ancestor_id,
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item.span);
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self.define(parent, ident, TypeNS, (module, vis, sp, expansion));
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for variant in &(*enum_definition).variants {
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@ -370,7 +373,10 @@ impl<'a> Resolver<'a> {
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// Add all the items within to a new module.
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let module_kind = ModuleKind::Def(Def::Trait(def_id), ident.name);
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let module = self.new_module(parent, module_kind, parent.normal_ancestor_id);
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let module = self.new_module(parent,
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module_kind,
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parent.normal_ancestor_id,
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item.span);
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self.define(parent, ident, TypeNS, (module, vis, sp, expansion));
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self.current_module = module;
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}
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@ -419,7 +425,7 @@ impl<'a> Resolver<'a> {
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let parent = self.current_module;
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if self.block_needs_anonymous_module(block) {
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let module =
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self.new_module(parent, ModuleKind::Block(block.id), parent.normal_ancestor_id);
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self.new_module(parent, ModuleKind::Block(block.id), parent.normal_ancestor_id, block.span);
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self.block_map.insert(block.id, module);
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self.current_module = module; // Descend into the block.
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}
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@ -431,10 +437,14 @@ impl<'a> Resolver<'a> {
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let def = child.def;
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let def_id = def.def_id();
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let vis = self.session.cstore.visibility(def_id);
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let span = child.span;
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match def {
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Def::Mod(..) | Def::Enum(..) => {
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let module = self.new_module(parent, ModuleKind::Def(def, ident.name), def_id);
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let module = self.new_module(parent,
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ModuleKind::Def(def, ident.name),
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def_id,
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span);
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self.define(parent, ident, TypeNS, (module, vis, DUMMY_SP, Mark::root()));
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}
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Def::Variant(..) | Def::TyAlias(..) => {
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@ -454,7 +464,10 @@ impl<'a> Resolver<'a> {
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}
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Def::Trait(..) => {
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let module_kind = ModuleKind::Def(def, ident.name);
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let module = self.new_module(parent, module_kind, parent.normal_ancestor_id);
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let module = self.new_module(parent,
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module_kind,
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parent.normal_ancestor_id,
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span);
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self.define(parent, ident, TypeNS, (module, vis, DUMMY_SP, Mark::root()));
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for child in self.session.cstore.item_children(def_id) {
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@ -483,18 +496,18 @@ impl<'a> Resolver<'a> {
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}
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}
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fn get_extern_crate_root(&mut self, cnum: CrateNum) -> Module<'a> {
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fn get_extern_crate_root(&mut self, cnum: CrateNum, span: Span) -> Module<'a> {
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let def_id = DefId { krate: cnum, index: CRATE_DEF_INDEX };
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let name = self.session.cstore.crate_name(cnum);
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let macros_only = self.session.cstore.dep_kind(cnum).macros_only();
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let module_kind = ModuleKind::Def(Def::Mod(def_id), name);
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let arenas = self.arenas;
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*self.extern_crate_roots.entry((cnum, macros_only)).or_insert_with(|| {
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arenas.alloc_module(ModuleData::new(None, module_kind, def_id))
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arenas.alloc_module(ModuleData::new(None, module_kind, def_id, span))
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})
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}
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pub fn macro_def_scope(&mut self, expansion: Mark) -> Module<'a> {
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pub fn macro_def_scope(&mut self, expansion: Mark, span: Span) -> Module<'a> {
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let def_id = self.macro_defs[&expansion];
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if let Some(id) = self.definitions.as_local_node_id(def_id) {
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self.local_macro_def_scopes[&id]
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@ -503,7 +516,7 @@ impl<'a> Resolver<'a> {
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self.graph_root
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} else {
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let module_def_id = ty::DefIdTree::parent(&*self, def_id).unwrap();
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self.get_extern_crate_root(module_def_id.krate)
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self.get_extern_crate_root(module_def_id.krate, span)
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}
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}
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@ -865,12 +865,15 @@ pub struct ModuleData<'a> {
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// access the children must be preceded with a
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// `populate_module_if_necessary` call.
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populated: Cell<bool>,
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/// Span of the module itself. Used for error reporting.
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span: Span,
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}
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pub type Module<'a> = &'a ModuleData<'a>;
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impl<'a> ModuleData<'a> {
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fn new(parent: Option<Module<'a>>, kind: ModuleKind, normal_ancestor_id: DefId) -> Self {
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fn new(parent: Option<Module<'a>>, kind: ModuleKind, normal_ancestor_id: DefId, span: Span) -> Self {
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ModuleData {
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parent: parent,
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kind: kind,
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@ -884,6 +887,7 @@ impl<'a> ModuleData<'a> {
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globs: RefCell::new((Vec::new())),
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traits: RefCell::new(None),
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populated: Cell::new(normal_ancestor_id.is_local()),
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span: span,
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}
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}
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@ -1298,7 +1302,7 @@ impl<'a> Resolver<'a> {
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let root_module_kind = ModuleKind::Def(Def::Mod(root_def_id), keywords::Invalid.name());
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let graph_root = arenas.alloc_module(ModuleData {
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no_implicit_prelude: attr::contains_name(&krate.attrs, "no_implicit_prelude"),
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..ModuleData::new(None, root_module_kind, root_def_id)
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..ModuleData::new(None, root_module_kind, root_def_id, krate.span)
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});
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let mut module_map = FxHashMap();
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module_map.insert(DefId::local(CRATE_DEF_INDEX), graph_root);
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@ -1430,9 +1434,9 @@ impl<'a> Resolver<'a> {
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self.crate_loader.postprocess(krate);
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}
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fn new_module(&self, parent: Module<'a>, kind: ModuleKind, normal_ancestor_id: DefId)
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fn new_module(&self, parent: Module<'a>, kind: ModuleKind, normal_ancestor_id: DefId, span: Span)
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-> Module<'a> {
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self.arenas.alloc_module(ModuleData::new(Some(parent), kind, normal_ancestor_id))
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self.arenas.alloc_module(ModuleData::new(Some(parent), kind, normal_ancestor_id, span))
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}
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fn record_use(&mut self, ident: Ident, ns: Namespace, binding: &'a NameBinding<'a>, span: Span)
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@ -1535,12 +1539,12 @@ impl<'a> Resolver<'a> {
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None
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}
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fn resolve_crate_var(&mut self, crate_var_ctxt: SyntaxContext) -> Module<'a> {
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fn resolve_crate_var(&mut self, crate_var_ctxt: SyntaxContext, span: Span) -> Module<'a> {
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let mut ctxt_data = crate_var_ctxt.data();
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while ctxt_data.prev_ctxt != SyntaxContext::empty() {
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ctxt_data = ctxt_data.prev_ctxt.data();
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}
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let module = self.macro_def_scope(ctxt_data.outer_mark);
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let module = self.macro_def_scope(ctxt_data.outer_mark, span);
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if module.is_local() { self.graph_root } else { module }
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}
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@ -2271,8 +2275,10 @@ impl<'a> Resolver<'a> {
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let name = path.last().unwrap().name;
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let candidates = this.lookup_import_candidates(name, ns, is_expected);
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if !candidates.is_empty() {
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let mut module_span = this.current_module.span;
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module_span.hi = module_span.lo;
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// Report import candidates as help and proceed searching for labels.
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show_candidates(&mut err, &candidates, def.is_some());
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show_candidates(&mut err, module_span, &candidates, def.is_some());
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} else if is_expected(Def::Enum(DefId::local(CRATE_DEF_INDEX))) {
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let enum_candidates = this.lookup_import_candidates(name, ns, is_enum_variant);
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let mut enum_candidates = enum_candidates.iter()
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@ -2584,7 +2590,7 @@ impl<'a> Resolver<'a> {
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module = Some(self.graph_root);
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continue
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} else if i == 0 && ns == TypeNS && ident.name == "$crate" {
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module = Some(self.resolve_crate_var(ident.ctxt));
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module = Some(self.resolve_crate_var(ident.ctxt, DUMMY_SP));
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continue
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}
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@ -3463,12 +3469,10 @@ fn import_candidate_to_paths(suggestion: &ImportSuggestion) -> (Span, String, St
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/// When an entity with a given name is not available in scope, we search for
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/// entities with that name in all crates. This method allows outputting the
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/// results of this search in a programmer-friendly way
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fn show_candidates(session: &mut DiagnosticBuilder,
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fn show_candidates(err: &mut DiagnosticBuilder,
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span: Span,
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candidates: &[ImportSuggestion],
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better: bool) {
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// don't show more than MAX_CANDIDATES results, so
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// we're consistent with the trait suggestions
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const MAX_CANDIDATES: usize = 4;
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// we want consistent results across executions, but candidates are produced
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// by iterating through a hash map, so make sure they are ordered:
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@ -3481,21 +3485,13 @@ fn show_candidates(session: &mut DiagnosticBuilder,
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1 => " is found in another module, you can import it",
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_ => "s are found in other modules, you can import them",
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};
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let msg = format!("possible {}candidate{} into scope", better, msg_diff);
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let end = cmp::min(MAX_CANDIDATES, path_strings.len());
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session.help(&format!("possible {}candidate{} into scope:{}{}",
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better,
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msg_diff,
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&path_strings[0..end].iter().map(|candidate| {
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format!("\n `use {};`", candidate)
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}).collect::<String>(),
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if path_strings.len() > MAX_CANDIDATES {
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format!("\nand {} other candidates",
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path_strings.len() - MAX_CANDIDATES)
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} else {
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"".to_owned()
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}
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));
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for candidate in &mut path_strings {
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*candidate = format!("use {};\n", candidate);
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}
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err.span_suggestions(span, &msg, path_strings);
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}
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/// A somewhat inefficient routine to obtain the name of a module.
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@ -123,14 +123,14 @@ impl<'a> base::Resolver for Resolver<'a> {
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}
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fn eliminate_crate_var(&mut self, item: P<ast::Item>) -> P<ast::Item> {
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struct EliminateCrateVar<'b, 'a: 'b>(&'b mut Resolver<'a>);
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struct EliminateCrateVar<'b, 'a: 'b>(&'b mut Resolver<'a>, Span);
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impl<'a, 'b> Folder for EliminateCrateVar<'a, 'b> {
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fn fold_path(&mut self, mut path: ast::Path) -> ast::Path {
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let ident = path.segments[0].identifier;
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if ident.name == "$crate" {
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path.segments[0].identifier.name = keywords::CrateRoot.name();
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let module = self.0.resolve_crate_var(ident.ctxt);
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let module = self.0.resolve_crate_var(ident.ctxt, self.1);
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if !module.is_local() {
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let span = path.segments[0].span;
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path.segments.insert(1, match module.kind {
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@ -149,7 +149,7 @@ impl<'a> base::Resolver for Resolver<'a> {
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}
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}
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EliminateCrateVar(self).fold_item(item).expect_one("")
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EliminateCrateVar(self, item.span).fold_item(item).expect_one("")
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}
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fn is_whitelisted_legacy_custom_derive(&self, name: Name) -> bool {
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@ -4,8 +4,8 @@ error[E0425]: cannot find value `A` in module `namespaced_enums`
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15 | let _ = namespaced_enums::A;
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| ^ not found in `namespaced_enums`
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= help: possible candidate is found in another module, you can import it into scope:
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`use namespaced_enums::Foo::A;`
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help: possible candidate is found in another module, you can import it into scope
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| use namespaced_enums::Foo::A;
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error[E0425]: cannot find function `B` in module `namespaced_enums`
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--> $DIR/enums-are-namespaced-xc.rs:18:31
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@ -13,8 +13,8 @@ error[E0425]: cannot find function `B` in module `namespaced_enums`
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18 | let _ = namespaced_enums::B(10);
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| ^ not found in `namespaced_enums`
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= help: possible candidate is found in another module, you can import it into scope:
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`use namespaced_enums::Foo::B;`
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help: possible candidate is found in another module, you can import it into scope
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| use namespaced_enums::Foo::B;
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error[E0422]: cannot find struct, variant or union type `C` in module `namespaced_enums`
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--> $DIR/enums-are-namespaced-xc.rs:21:31
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@ -22,8 +22,8 @@ error[E0422]: cannot find struct, variant or union type `C` in module `namespace
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21 | let _ = namespaced_enums::C { a: 10 };
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| ^ not found in `namespaced_enums`
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= help: possible candidate is found in another module, you can import it into scope:
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||||
`use namespaced_enums::Foo::C;`
|
||||
help: possible candidate is found in another module, you can import it into scope
|
||||
| use namespaced_enums::Foo::C;
|
||||
|
||||
error: aborting due to 3 previous errors
|
||||
|
||||
|
|
|
|||
|
|
@ -4,10 +4,10 @@ error[E0574]: expected struct, variant or union type, found enum `Result`
|
|||
19 | Result {
|
||||
| ^^^^^^ not a struct, variant or union type
|
||||
|
|
||||
= help: possible better candidates are found in other modules, you can import them into scope:
|
||||
`use std::fmt::Result;`
|
||||
`use std::io::Result;`
|
||||
`use std::thread::Result;`
|
||||
help: possible better candidates are found in other modules, you can import them into scope
|
||||
| use std::fmt::Result;
|
||||
| use std::io::Result;
|
||||
| use std::thread::Result;
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
|
|
|
|||
|
|
@ -4,8 +4,8 @@ error[E0422]: cannot find struct, variant or union type `E` in this scope
|
|||
16 | E { name: "foobar" }; //~ ERROR unresolved struct, variant or union type `E`
|
||||
| ^ not found in this scope
|
||||
|
|
||||
= help: possible candidate is found in another module, you can import it into scope:
|
||||
`use SomeEnum::E;`
|
||||
help: possible candidate is found in another module, you can import it into scope
|
||||
| use SomeEnum::E;
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
|
|
|
|||
|
|
@ -4,10 +4,10 @@ error[E0405]: cannot find trait `Mul` in this scope
|
|||
53 | impl Mul for Foo {
|
||||
| ^^^ not found in this scope
|
||||
|
|
||||
= help: possible candidates are found in other modules, you can import them into scope:
|
||||
`use mul1::Mul;`
|
||||
`use mul2::Mul;`
|
||||
`use std::ops::Mul;`
|
||||
help: possible candidates are found in other modules, you can import them into scope
|
||||
| use mul1::Mul;
|
||||
| use mul2::Mul;
|
||||
| use std::ops::Mul;
|
||||
|
||||
error[E0412]: cannot find type `Mul` in this scope
|
||||
--> $DIR/issue-21221-1.rs:72:16
|
||||
|
|
@ -15,12 +15,12 @@ error[E0412]: cannot find type `Mul` in this scope
|
|||
72 | fn getMul() -> Mul {
|
||||
| ^^^ not found in this scope
|
||||
|
|
||||
= help: possible candidates are found in other modules, you can import them into scope:
|
||||
`use mul1::Mul;`
|
||||
`use mul2::Mul;`
|
||||
`use mul3::Mul;`
|
||||
`use mul4::Mul;`
|
||||
and 2 other candidates
|
||||
help: possible candidates are found in other modules, you can import them into scope
|
||||
| use mul1::Mul;
|
||||
| use mul2::Mul;
|
||||
| use mul3::Mul;
|
||||
| use mul4::Mul;
|
||||
and 2 other candidates
|
||||
|
||||
error[E0405]: cannot find trait `ThisTraitReallyDoesntExistInAnyModuleReally` in this scope
|
||||
--> $DIR/issue-21221-1.rs:83:6
|
||||
|
|
@ -34,8 +34,8 @@ error[E0405]: cannot find trait `Div` in this scope
|
|||
88 | impl Div for Foo {
|
||||
| ^^^ not found in this scope
|
||||
|
|
||||
= help: possible candidate is found in another module, you can import it into scope:
|
||||
`use std::ops::Div;`
|
||||
help: possible candidate is found in another module, you can import it into scope
|
||||
| use std::ops::Div;
|
||||
|
||||
error: cannot continue compilation due to previous error
|
||||
|
||||
|
|
|
|||
|
|
@ -4,8 +4,8 @@ error[E0405]: cannot find trait `T` in this scope
|
|||
28 | impl T for Foo { }
|
||||
| ^ not found in this scope
|
||||
|
|
||||
= help: possible candidate is found in another module, you can import it into scope:
|
||||
`use foo::bar::T;`
|
||||
help: possible candidate is found in another module, you can import it into scope
|
||||
| use foo::bar::T;
|
||||
|
||||
error: main function not found
|
||||
|
||||
|
|
|
|||
|
|
@ -4,8 +4,8 @@ error[E0405]: cannot find trait `OuterTrait` in this scope
|
|||
25 | impl OuterTrait for Foo {}
|
||||
| ^^^^^^^^^^ not found in this scope
|
||||
|
|
||||
= help: possible candidate is found in another module, you can import it into scope:
|
||||
`use issue_21221_3::outer::OuterTrait;`
|
||||
help: possible candidate is found in another module, you can import it into scope
|
||||
| use issue_21221_3::outer::OuterTrait;
|
||||
|
||||
error: cannot continue compilation due to previous error
|
||||
|
||||
|
|
|
|||
|
|
@ -4,8 +4,8 @@ error[E0405]: cannot find trait `T` in this scope
|
|||
20 | impl T for Foo {}
|
||||
| ^ not found in this scope
|
||||
|
|
||||
= help: possible candidate is found in another module, you can import it into scope:
|
||||
`use issue_21221_4::T;`
|
||||
help: possible candidate is found in another module, you can import it into scope
|
||||
| use issue_21221_4::T;
|
||||
|
||||
error: cannot continue compilation due to previous error
|
||||
|
||||
|
|
|
|||
|
|
@ -4,8 +4,8 @@ error[E0404]: expected trait, found type alias `Foo`
|
|||
20 | impl Foo for S { //~ ERROR expected trait, found type alias `Foo`
|
||||
| ^^^ type aliases cannot be used for traits
|
||||
|
|
||||
= help: possible better candidate is found in another module, you can import it into scope:
|
||||
`use issue_3907::Foo;`
|
||||
help: possible better candidate is found in another module, you can import it into scope
|
||||
| use issue_3907::Foo;
|
||||
|
||||
error: cannot continue compilation due to previous error
|
||||
|
||||
|
|
|
|||
|
|
@ -8,8 +8,8 @@ error[E0423]: expected value, found struct `Z`
|
|||
| did you mean `S`?
|
||||
| constructor is not visible here due to private fields
|
||||
|
|
||||
= help: possible better candidate is found in another module, you can import it into scope:
|
||||
`use m::n::Z;`
|
||||
help: possible better candidate is found in another module, you can import it into scope
|
||||
| use m::n::Z;
|
||||
|
||||
error[E0423]: expected value, found struct `S`
|
||||
--> $DIR/privacy-struct-ctor.rs:36:5
|
||||
|
|
@ -20,8 +20,8 @@ error[E0423]: expected value, found struct `S`
|
|||
| did you mean `S { /* fields */ }`?
|
||||
| constructor is not visible here due to private fields
|
||||
|
|
||||
= help: possible better candidate is found in another module, you can import it into scope:
|
||||
`use m::S;`
|
||||
help: possible better candidate is found in another module, you can import it into scope
|
||||
| use m::S;
|
||||
|
||||
error[E0423]: expected value, found struct `xcrate::S`
|
||||
--> $DIR/privacy-struct-ctor.rs:42:5
|
||||
|
|
@ -32,8 +32,8 @@ error[E0423]: expected value, found struct `xcrate::S`
|
|||
| did you mean `xcrate::S { /* fields */ }`?
|
||||
| constructor is not visible here due to private fields
|
||||
|
|
||||
= help: possible better candidate is found in another module, you can import it into scope:
|
||||
`use m::S;`
|
||||
help: possible better candidate is found in another module, you can import it into scope
|
||||
| use m::S;
|
||||
|
||||
error: tuple struct `Z` is private
|
||||
--> $DIR/privacy-struct-ctor.rs:25:9
|
||||
|
|
|
|||
|
|
@ -4,8 +4,8 @@ error[E0404]: expected trait, found type parameter `Add`
|
|||
15 | impl<T: Clone, Add> Add for Foo<T> {
|
||||
| ^^^ not a trait
|
||||
|
|
||||
= help: possible better candidate is found in another module, you can import it into scope:
|
||||
`use std::ops::Add;`
|
||||
help: possible better candidate is found in another module, you can import it into scope
|
||||
| use std::ops::Add;
|
||||
|
||||
error: main function not found
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue