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Tweak fully_expand_fragment loop.

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Control flow never gets past the end of the `ExpandResult::Retry` match
arm, due to the `span_bug` and the `continue`. Therefore, the code after
the match can only be reached from the `ExpandResult::Ready` arm.

This commit moves that code after the match into the
`ExpandResult::Ready` arm, avoiding the need for the `continue` in the
`ExpandResult::Retry` arm.
This commit is contained in:
Nicholas Nethercote 2024-05-01 10:25:55 +10:00
parent 79c4d0202f
commit 3b6978196d
1 changed files with 9 additions and 11 deletions
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20
compiler/rustc_expand/src/expand.rs
View file

@ -471,7 +471,7 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
self.cx.force_mode = force;
let fragment_kind = invoc.fragment_kind;
let (expanded_fragment, new_invocations) = match self.expand_invoc(invoc, &ext.kind) {
match self.expand_invoc(invoc, &ext.kind) {
ExpandResult::Ready(fragment) => {
let mut derive_invocations = Vec::new();
let derive_placeholders = self
@ -503,13 +503,19 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
})
.unwrap_or_default();
let (fragment, collected_invocations) =
let (expanded_fragment, collected_invocations) =
self.collect_invocations(fragment, &derive_placeholders);
// We choose to expand any derive invocations associated with this macro
// invocation *before* any macro invocations collected from the output
// fragment.
derive_invocations.extend(collected_invocations);
(fragment, derive_invocations)
progress = true;
if expanded_fragments.len() < depth {
expanded_fragments.push(Vec::new());
}
expanded_fragments[depth - 1].push((expn_id, expanded_fragment));
invocations.extend(derive_invocations.into_iter().rev());
}
ExpandResult::Retry(invoc) => {
if force {
@ -520,17 +526,9 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
} else {
// Cannot expand, will retry this invocation later.
undetermined_invocations.push((invoc, Some(ext)));
continue;
}
}
};
progress = true;
if expanded_fragments.len() < depth {
expanded_fragments.push(Vec::new());
}
expanded_fragments[depth - 1].push((expn_id, expanded_fragment));
invocations.extend(new_invocations.into_iter().rev());
}
self.cx.current_expansion = orig_expansion_data;