[RFC 3127 - Trim Paths]: Add test for -Zremap-path-scope=diagnostics

tests/ui/errors/remap-path-prefix.normal.stderr

@@ -1,5 +1,5 @@
 error[E0425]: cannot find value `ferris` in this scope
-  --> remapped/errors/remap-path-prefix.rs:16:5
+  --> remapped/errors/remap-path-prefix.rs:19:5
    |
 LL |     ferris
    |     ^^^^^^ not found in this scope

tests/ui/errors/remap-path-prefix.rs

@@ -1,4 +1,7 @@
+// revisions: normal with-diagnostic-scope without-diagnostic-scope
 // compile-flags: --remap-path-prefix={{src-base}}=remapped
+// [with-diagnostic-scope]compile-flags: -Zremap-path-scope=diagnostics
+// [without-diagnostic-scope]compile-flags: -Zremap-path-scope=object
 // no-remap-src-base: Manually remap, so the remapped path remains in .stderr file.
 
 // The remapped paths are not normalized by compiletest.

tests/ui/errors/remap-path-prefix.with-diagnostic-scope.stderr

@@ -0,0 +1,9 @@
+error[E0425]: cannot find value `ferris` in this scope
+  --> remapped/errors/remap-path-prefix.rs:19:5
+   |
+LL |     ferris
+   |     ^^^^^^ not found in this scope
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0425`.

tests/ui/errors/remap-path-prefix.without-diagnostic-scope.stderr

@@ -0,0 +1,9 @@
+error[E0425]: cannot find value `ferris` in this scope
+  --> $DIR/remap-path-prefix.rs:19:5
+   |
+LL |     ferris
+   |     ^^^^^^ not found in this scope
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0425`.