Allow tracking issues for lang features.

This is similar to the libs version, which allow an `issue` field in the
`#[unstable]` attribute.

cc #28244

6 files changed, 10 insertions, 2 deletions

diff --git a/src/libsyntax/ext/asm.rs b/src/libsyntax/ext/asm.rs
index c48b740d83a..f1aa8139ec1 100644
--- a/src/libsyntax/ext/asm.rs
+++ b/src/libsyntax/ext/asm.rs
@@ -51,7 +51,9 @@ pub fn expand_asm<'cx>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
                        -> Box<base::MacResult+'cx> {
     if !cx.ecfg.enable_asm() {
         feature_gate::emit_feature_err(
-            &cx.parse_sess.span_diagnostic, "asm", sp, feature_gate::EXPLAIN_ASM);
+            &cx.parse_sess.span_diagnostic, "asm", sp,
+            feature_gate::GateIssue::Language,
+            feature_gate::EXPLAIN_ASM);
         return DummyResult::expr(sp);
     }
 
diff --git a/src/libsyntax/ext/concat_idents.rs b/src/libsyntax/ext/concat_idents.rs
index 24436c4520d..c31a767300c 100644
--- a/src/libsyntax/ext/concat_idents.rs
+++ b/src/libsyntax/ext/concat_idents.rs
@@ -23,6 +23,7 @@ pub fn expand_syntax_ext<'cx>(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree]
         feature_gate::emit_feature_err(&cx.parse_sess.span_diagnostic,
                                        "concat_idents",
                                        sp,
+                                       feature_gate::GateIssue::Language,
                                        feature_gate::EXPLAIN_CONCAT_IDENTS);
         return base::DummyResult::expr(sp);
     }
diff --git a/src/libsyntax/ext/deriving/mod.rs b/src/libsyntax/ext/deriving/mod.rs
index 36deaf488e1..c7f582854ae 100644
--- a/src/libsyntax/ext/deriving/mod.rs
+++ b/src/libsyntax/ext/deriving/mod.rs
@@ -105,6 +105,7 @@ fn expand_derive(cx: &mut ExtCtxt,
                     feature_gate::emit_feature_err(&cx.parse_sess.span_diagnostic,
                                                    "custom_derive",
                                                    titem.span,
+                                                   feature_gate::GateIssue::Language,
                                                    feature_gate::EXPLAIN_CUSTOM_DERIVE);
                     continue;
                 }
diff --git a/src/libsyntax/ext/expand.rs b/src/libsyntax/ext/expand.rs
index fd70dd175fc..1991124ae26 100644
--- a/src/libsyntax/ext/expand.rs
+++ b/src/libsyntax/ext/expand.rs
@@ -778,6 +778,7 @@ pub fn expand_item_mac(it: P<ast::Item>,
                             &fld.cx.parse_sess.span_diagnostic,
                             "allow_internal_unstable",
                             it.span,
+                            feature_gate::GateIssue::Language,
                             feature_gate::EXPLAIN_ALLOW_INTERNAL_UNSTABLE)
                     }
 
@@ -1469,7 +1470,8 @@ pub fn expand_type(t: P<ast::Ty>, fld: &mut MacroExpander) -> P<ast::Ty> {
                     &fld.cx.parse_sess.span_diagnostic,
                     "type_macros",
                     t.span,
-                    "type macros are experimental (see issue: #27336)");
+                    feature_gate::GateIssue::Language,
+                    "type macros are experimental");
 
                 DummyResult::raw_ty(t.span)
             }
diff --git a/src/libsyntax/ext/log_syntax.rs b/src/libsyntax/ext/log_syntax.rs
index 9869108952c..5f7ce8d9941 100644
--- a/src/libsyntax/ext/log_syntax.rs
+++ b/src/libsyntax/ext/log_syntax.rs
@@ -22,6 +22,7 @@ pub fn expand_syntax_ext<'cx>(cx: &'cx mut base::ExtCtxt,
         feature_gate::emit_feature_err(&cx.parse_sess.span_diagnostic,
                                        "log_syntax",
                                        sp,
+                                       feature_gate::GateIssue::Language,
                                        feature_gate::EXPLAIN_LOG_SYNTAX);
         return base::DummyResult::any(sp);
     }
diff --git a/src/libsyntax/ext/trace_macros.rs b/src/libsyntax/ext/trace_macros.rs
index 646e6fec405..ab34f41d932 100644
--- a/src/libsyntax/ext/trace_macros.rs
+++ b/src/libsyntax/ext/trace_macros.rs
@@ -24,6 +24,7 @@ pub fn expand_trace_macros(cx: &mut ExtCtxt,
         feature_gate::emit_feature_err(&cx.parse_sess.span_diagnostic,
                                        "trace_macros",
                                        sp,
+                                       feature_gate::GateIssue::Language,
                                        feature_gate::EXPLAIN_TRACE_MACROS);
         return base::DummyResult::any(sp);
     }