Keep 4 entries in CachingSourceMapView.

cjgillot · cjgillot · commit 07409a9d4d04 · 2025-07-13T15:03:28.000Z
diff --git a/compiler/rustc_span/src/caching_source_map_view.rs b/compiler/rustc_span/src/caching_source_map_view.rs
@@ -55,7 +55,7 @@ impl CacheEntry {
 #[derive(Clone)]
 pub struct CachingSourceMapView<'sm> {
     source_map: &'sm SourceMap,
-    line_cache: [CacheEntry; 3],
+    line_cache: [CacheEntry; 4],
     time_stamp: usize,
 }
 
@@ -73,7 +73,7 @@ impl<'sm> CachingSourceMapView<'sm> {
 
         CachingSourceMapView {
             source_map,
-            line_cache: [entry.clone(), entry.clone(), entry],
+            line_cache: [entry.clone(), entry.clone(), entry.clone(), entry],
             time_stamp: 0,
         }
     }

Original file line number	Diff line number	Diff line change
`@@ -55,7 +55,7 @@ impl CacheEntry {`
`55`	`55`	`#[derive(Clone)]`
`56`	`56`	`pub struct CachingSourceMapView<'sm> {`
`57`	`57`	`source_map: &'sm SourceMap,`
`58`		`- line_cache: [CacheEntry; 3],`
	`58`	`+ line_cache: [CacheEntry; 4],`
`59`	`59`	`time_stamp: usize,`
`60`	`60`	`}`
`61`	`61`
`@@ -73,7 +73,7 @@ impl<'sm> CachingSourceMapView<'sm> {`
`73`	`73`
`74`	`74`	`CachingSourceMapView {`
`75`	`75`	`source_map,`
`76`		`- line_cache: [entry.clone(), entry.clone(), entry],`
	`76`	`+ line_cache: [entry.clone(), entry.clone(), entry.clone(), entry],`
`77`	`77`	`time_stamp: 0,`
`78`	`78`	`}`
`79`	`79`	`}`