Rollup merge of #80859 - jsgf:fix-pretty-remap, r=davidtwco

Fix --pretty=expanded with --remap-path-prefix

Per https://github.com/rust-lang/rust/issues/80832, using
--pretty=expanded and --remap-path-prefix results in an ICE.

This is becasue the session source files table is stored in remapped
form, whereas --pretty-expanded looks up unremapped files. This remaps
the path prefixes before lookup.

~~There don't appear to be any existing tests for --pretty=expanded; I'll look into
adding some.~~ Never mind, found the pretty tests.

Fixes #80832

1 files changed, 9 insertions, 2 deletions

diff --git a/compiler/rustc_driver/src/pretty.rs b/compiler/rustc_driver/src/pretty.rs
index 305fa838afa..b7edc24bc4a 100644
--- a/compiler/rustc_driver/src/pretty.rs
+++ b/compiler/rustc_driver/src/pretty.rs
@@ -363,8 +363,15 @@ impl<'tcx> pprust_hir::PpAnn for TypedAnnotation<'tcx> {
 
 fn get_source(input: &Input, sess: &Session) -> (String, FileName) {
     let src_name = input.source_name();
-    let src =
-        String::clone(&sess.source_map().get_source_file(&src_name).unwrap().src.as_ref().unwrap());
+    let src = String::clone(
+        &sess
+            .source_map()
+            .get_source_file(&src_name)
+            .expect("get_source_file")
+            .src
+            .as_ref()
+            .expect("src"),
+    );
     (src, src_name)
 }