errors: impl IntoDiagnosticArg for TargetTriple

Forward the `Display` implementation for `CrateType` to
`IntoDiagnosticArg` so that it can be used in diagnostic structs.

Signed-off-by: David Wood <david.wood@huawei.com>

Author: davidtwco

compiler/rustc_errors/Cargo.toml

@@ -7,22 +7,22 @@ edition = "2021"
 doctest = false
 
 [dependencies]
-tracing = "0.1"
+annotate-snippets = "0.9"
+atty = "0.2"
+rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_error_messages = { path = "../rustc_error_messages" }
+rustc_hir = { path = "../rustc_hir" }
+rustc_lint_defs = { path = "../rustc_lint_defs" }
+rustc_macros = { path = "../rustc_macros" }
 rustc_serialize = { path = "../rustc_serialize" }
 rustc_span = { path = "../rustc_span" }
-rustc_macros = { path = "../rustc_macros" }
-rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_target = { path = "../rustc_target" }
-rustc_hir = { path = "../rustc_hir" }
-rustc_lint_defs = { path = "../rustc_lint_defs" }
-unicode-width = "0.1.4"
-atty = "0.2"
-termcolor = "1.0"
-annotate-snippets = "0.9"
-termize = "0.1.1"
 serde = { version = "1.0.125", features = [ "derive" ] }
 serde_json = "1.0.59"
+termcolor = "1.0"
+termize = "0.1.1"
+tracing = "0.1"
+unicode-width = "0.1.4"
 
 [target.'cfg(windows)'.dependencies]
 winapi = { version = "0.3", features = [ "handleapi", "synchapi", "winbase" ] }

compiler/rustc_errors/src/diagnostic.rs

@@ -100,7 +100,7 @@ into_diagnostic_arg_using_display!(
     MacroRulesNormalizedIdent,
     ParseIntError,
     StackProtector,
-    &TargetTriple,
+    TargetTriple,
     SplitDebuginfo
 );