Auto merge of #79138 - m-ou-se:rollup-owel5ld, r=m-ou-se

Rollup of 8 pull requests

Successful merges:

 - #74293 (Rustdoc test compiler output color)
 - #78702 ([self-profiling] Include the estimated size of each cgu in the profile)
 - #79069 (Get rid of `highlight::Class::None`)
 - #79072 (Fix exhaustiveness in case a byte string literal is used at slice type)
 - #79120 (update rustfmt to v1.4.27)
 - #79125 (Get rid of clean::{Method, TyMethod})
 - #79126 (Remove duplicate `Trait::auto` field)
 - #79130 (extend macro braces test)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

1 files changed, 17 insertions, 0 deletions

diff --git a/compiler/rustc_errors/src/emitter.rs b/compiler/rustc_errors/src/emitter.rs
index 302713a21db..32104e6f00d 100644
--- a/compiler/rustc_errors/src/emitter.rs
+++ b/compiler/rustc_errors/src/emitter.rs
@@ -200,6 +200,11 @@ pub trait Emitter {
         true
     }
 
+    /// Checks if we can use colors in the current output stream.
+    fn supports_color(&self) -> bool {
+        false
+    }
+
     fn source_map(&self) -> Option<&Lrc<SourceMap>>;
 
     /// Formats the substitutions of the primary_span
@@ -504,6 +509,10 @@ impl Emitter for EmitterWriter {
     fn should_show_explain(&self) -> bool {
         !self.short_message
     }
+
+    fn supports_color(&self) -> bool {
+        self.dst.supports_color()
+    }
 }
 
 /// An emitter that does nothing when emitting a diagnostic.
@@ -2057,6 +2066,14 @@ impl Destination {
             Destination::Raw(ref mut t, true) => WritableDst::ColoredRaw(Ansi::new(t)),
         }
     }
+
+    fn supports_color(&self) -> bool {
+        match *self {
+            Self::Terminal(ref stream) => stream.supports_color(),
+            Self::Buffered(ref buffer) => buffer.buffer().supports_color(),
+            Self::Raw(_, supports_color) => supports_color,
+        }
+    }
 }
 
 impl<'a> WritableDst<'a> {