code suggestion for deprecated-attribute lint

Also, fix the deprecation message for the late no-debug feature.
rust-lang · Sep 30, 2017 · f2c5acd · f2c5acd
1 parent d663003
commit f2c5acd
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Showing 3 changed files with 8 additions and 6 deletions.
diff --git a/src/librustc_lint/builtin.rs b/src/librustc_lint/builtin.rs
@@ -650,10 +650,11 @@ impl EarlyLintPass for DeprecatedAttr {
                                              ref name,
                                              ref reason,
                                              _) = g {
-                    cx.span_lint(DEPRECATED,
-                                 attr.span,
-                                 &format!("use of deprecated attribute `{}`: {}. See {}",
-                                          name, reason, link));
+                    let msg = format!("use of deprecated attribute `{}`: {}. See {}",
+                                      name, reason, link);
+                    let mut err = cx.struct_span_lint(DEPRECATED, attr.span, &msg);
+                    err.span_suggestion_short(attr.span, "remove this attribute", "".to_owned());
+                    err.emit();
                 }
                 return;
             }

diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs
@@ -824,7 +824,8 @@ pub const BUILTIN_ATTRIBUTES: &'static [(&'static str, AttributeType, AttributeG
     ("no_debug", Whitelisted, Gated(
         Stability::Deprecated("https://github.com/rust-lang/rust/issues/29721"),
         "no_debug",
-        "the `#[no_debug]` attribute is an experimental feature",
+        "the `#[no_debug]` attribute was an experimental feature that has been \
+         deprecated due to lack of demand",
         cfg_fn!(no_debug))),
     ("omit_gdb_pretty_printer_section", Whitelisted, Gated(Stability::Unstable,
                                                        "omit_gdb_pretty_printer_section",

diff --git a/src/test/compile-fail/feature-gate-no-debug.rs b/src/test/compile-fail/feature-gate-no-debug.rs
@@ -10,5 +10,5 @@
 
 #![allow(deprecated)]
 
-#[no_debug] //~ ERROR the `#[no_debug]` attribute is
+#[no_debug] //~ ERROR the `#[no_debug]` attribute was
 fn main() {}