Remove file_path_mapping param from ParseSess::new.

It's always empty.

compiler/rustc_expand/src/parse/tests.rs

@@ -14,17 +14,13 @@ use rustc_parse::new_parser_from_source_str;
 use rustc_parse::parser::ForceCollect;
 use rustc_session::parse::ParseSess;
 use rustc_span::create_default_session_globals_then;
-use rustc_span::source_map::FilePathMapping;
 use rustc_span::symbol::{kw, sym, Symbol};
 use rustc_span::{BytePos, FileName, Pos, Span};
 
 use std::path::PathBuf;
 
 fn sess() -> ParseSess {
-    ParseSess::new(
-        vec![crate::DEFAULT_LOCALE_RESOURCE, rustc_parse::DEFAULT_LOCALE_RESOURCE],
-        FilePathMapping::empty(),
-    )
+    ParseSess::new(vec![crate::DEFAULT_LOCALE_RESOURCE, rustc_parse::DEFAULT_LOCALE_RESOURCE])
 }
 
 /// Parses an item.

compiler/rustc_expand/src/tests.rs

@@ -72,10 +72,8 @@ where
 
 /// Maps a string to tts, using a made-up filename.
 pub(crate) fn string_to_stream(source_str: String) -> TokenStream {
-    let ps = ParseSess::new(
-        vec![crate::DEFAULT_LOCALE_RESOURCE, rustc_parse::DEFAULT_LOCALE_RESOURCE],
-        FilePathMapping::empty(),
-    );
+    let ps =
+        ParseSess::new(vec![crate::DEFAULT_LOCALE_RESOURCE, rustc_parse::DEFAULT_LOCALE_RESOURCE]);
     source_file_to_stream(
         &ps,
         ps.source_map().new_source_file(PathBuf::from("bogofile").into(), source_str),
@@ -85,10 +83,8 @@ pub(crate) fn string_to_stream(source_str: String) -> TokenStream {
 
 /// Parses a string, returns a crate.
 pub(crate) fn string_to_crate(source_str: String) -> ast::Crate {
-    let ps = ParseSess::new(
-        vec![crate::DEFAULT_LOCALE_RESOURCE, rustc_parse::DEFAULT_LOCALE_RESOURCE],
-        FilePathMapping::empty(),
-    );
+    let ps =
+        ParseSess::new(vec![crate::DEFAULT_LOCALE_RESOURCE, rustc_parse::DEFAULT_LOCALE_RESOURCE]);
     with_error_checking_parse(source_str, &ps, |p| p.parse_crate_mod())
 }
 

compiler/rustc_session/src/parse.rs

@@ -233,9 +233,9 @@ pub struct ParseSess {
 
 impl ParseSess {
     /// Used for testing.
-    pub fn new(locale_resources: Vec<&'static str>, file_path_mapping: FilePathMapping) -> Self {
+    pub fn new(locale_resources: Vec<&'static str>) -> Self {
         let fallback_bundle = fallback_fluent_bundle(locale_resources, false);
-        let sm = Lrc::new(SourceMap::new(file_path_mapping));
+        let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
         let emitter = Box::new(
             HumanEmitter::new(stderr_destination(ColorConfig::Auto), fallback_bundle)
                 .sm(Some(sm.clone())),

src/librustdoc/clean/render_macro_matchers.rs

@@ -4,7 +4,6 @@ use rustc_ast_pretty::pprust::state::State as Printer;
 use rustc_ast_pretty::pprust::PrintState;
 use rustc_middle::ty::TyCtxt;
 use rustc_session::parse::ParseSess;
-use rustc_span::source_map::FilePathMapping;
 use rustc_span::symbol::{kw, Ident, Symbol};
 use rustc_span::Span;
 
@@ -63,8 +62,7 @@ fn snippet_equal_to_token(tcx: TyCtxt<'_>, matcher: &TokenTree) -> Option<String
     let snippet = source_map.span_to_snippet(span).ok()?;
 
     // Create a Parser.
-    let sess =
-        ParseSess::new(rustc_driver::DEFAULT_LOCALE_RESOURCES.to_vec(), FilePathMapping::empty());
+    let sess = ParseSess::new(rustc_driver::DEFAULT_LOCALE_RESOURCES.to_vec());
     let file_name = source_map.span_to_filename(span);
     let mut parser =
         match rustc_parse::maybe_new_parser_from_source_str(&sess, file_name, snippet.clone()) {

tests/ui-fulldeps/mod_dir_path_canonicalized.rs

@@ -18,7 +18,6 @@ extern crate rustc_driver;
 
 use rustc_parse::new_parser_from_file;
 use rustc_session::parse::ParseSess;
-use rustc_span::source_map::FilePathMapping;
 use std::path::Path;
 
 #[path = "mod_dir_simple/test.rs"]
@@ -31,10 +30,7 @@ pub fn main() {
 }
 
 fn parse() {
-    let parse_session = ParseSess::new(
-        vec![rustc_parse::DEFAULT_LOCALE_RESOURCE],
-        FilePathMapping::empty()
-    );
+    let parse_session = ParseSess::new(vec![rustc_parse::DEFAULT_LOCALE_RESOURCE]);
 
     let path = Path::new(file!());
     let path = path.canonicalize().unwrap();

tests/ui-fulldeps/pprust-expr-roundtrip.rs

@@ -38,7 +38,7 @@ use rustc_ast::*;
 use rustc_ast_pretty::pprust;
 use rustc_parse::new_parser_from_source_str;
 use rustc_session::parse::ParseSess;
-use rustc_span::source_map::{FilePathMapping, Spanned};
+use rustc_span::source_map::Spanned;
 use rustc_span::symbol::Ident;
 use rustc_span::{FileName, DUMMY_SP};
 use thin_vec::{thin_vec, ThinVec};
@@ -225,7 +225,7 @@ fn main() {
 }
 
 fn run() {
-    let ps = ParseSess::new(vec![rustc_parse::DEFAULT_LOCALE_RESOURCE], FilePathMapping::empty());
+    let ps = ParseSess::new(vec![rustc_parse::DEFAULT_LOCALE_RESOURCE]);
 
     iter_exprs(2, &mut |mut e| {
         // If the pretty printer is correct, then `parse(print(e))` should be identical to `e`,