Rollup merge of #34531 - GuillaumeGomez:libsyntax_err_codes, r=jonathandturner

Add error codes in libsyntax

r? @jonathandturner

Fixes #34526

src/test/compile-fail/stability-attribute-sanity.rs

@@ -15,83 +15,84 @@
 #![stable(feature = "rust1", since = "1.0.0")]
 
 mod bogus_attribute_types_1 {
-    #[stable(feature = "a", since = "a", reason)] //~ ERROR unknown meta item 'reason'
+    #[stable(feature = "a", since = "a", reason)] //~ ERROR unknown meta item 'reason' [E0541]
     fn f1() { }
 
-    #[stable(feature = "a", since)] //~ ERROR incorrect meta item
+    #[stable(feature = "a", since)] //~ ERROR incorrect meta item [E0539]
     fn f2() { }
 
-    #[stable(feature, since = "a")] //~ ERROR incorrect meta item
+    #[stable(feature, since = "a")] //~ ERROR incorrect meta item [E0539]
     fn f3() { }
 
-    #[stable(feature = "a", since(b))] //~ ERROR incorrect meta item
+    #[stable(feature = "a", since(b))] //~ ERROR incorrect meta item [E0539]
     fn f5() { }
 
-    #[stable(feature(b), since = "a")] //~ ERROR incorrect meta item
+    #[stable(feature(b), since = "a")] //~ ERROR incorrect meta item [E0539]
     fn f6() { }
 }
 
 mod bogus_attribute_types_2 {
-    #[unstable] //~ ERROR incorrect stability attribute type
+    #[unstable] //~ ERROR incorrect stability attribute type [E0548]
     fn f1() { }
 
-    #[unstable = "a"] //~ ERROR incorrect stability attribute type
+    #[unstable = "a"] //~ ERROR incorrect stability attribute type [E0548]
     fn f2() { }
 
-    #[stable] //~ ERROR incorrect stability attribute type
+    #[stable] //~ ERROR incorrect stability attribute type [E0548]
     fn f3() { }
 
-    #[stable = "a"] //~ ERROR incorrect stability attribute type
+    #[stable = "a"] //~ ERROR incorrect stability attribute type [E0548]
     fn f4() { }
 
     #[stable(feature = "a", since = "b")]
-    #[rustc_deprecated] //~ ERROR incorrect stability attribute type
+    #[rustc_deprecated] //~ ERROR incorrect stability attribute type [E0548]
     fn f5() { }
 
     #[stable(feature = "a", since = "b")]
-    #[rustc_deprecated = "a"] //~ ERROR incorrect stability attribute type
+    #[rustc_deprecated = "a"] //~ ERROR incorrect stability attribute type [E0548]
     fn f6() { }
 }
 
 mod missing_feature_names {
-    #[unstable(issue = "0")] //~ ERROR missing 'feature'
+    #[unstable(issue = "0")] //~ ERROR missing 'feature' [E0546]
     fn f1() { }
 
-    #[unstable(feature = "a")] //~ ERROR missing 'issue'
+    #[unstable(feature = "a")] //~ ERROR missing 'issue' [E0547]
     fn f2() { }
 
-    #[stable(since = "a")] //~ ERROR missing 'feature'
+    #[stable(since = "a")] //~ ERROR missing 'feature' [E0546]
     fn f3() { }
 }
 
 mod missing_version {
-    #[stable(feature = "a")] //~ ERROR missing 'since'
+    #[stable(feature = "a")] //~ ERROR missing 'since' [E0542]
     fn f1() { }
 
     #[stable(feature = "a", since = "b")]
-    #[rustc_deprecated(reason = "a")] //~ ERROR missing 'since'
+    #[rustc_deprecated(reason = "a")] //~ ERROR missing 'since' [E0542]
     fn f2() { }
 }
 
 #[unstable(feature = "a", issue = "0")]
-#[stable(feature = "a", since = "b")]
-fn multiple1() { } //~ ERROR multiple stability levels
+#[stable(feature = "a", since = "b")] //~ ERROR multiple stability levels [E0544]
+fn multiple1() { }
 
 #[unstable(feature = "a", issue = "0")]
-#[unstable(feature = "a", issue = "0")]
-fn multiple2() { } //~ ERROR multiple stability levels
+#[unstable(feature = "a", issue = "0")] //~ ERROR multiple stability levels [E0544]
+fn multiple2() { }
 
 #[stable(feature = "a", since = "b")]
-#[stable(feature = "a", since = "b")]
-fn multiple3() { } //~ ERROR multiple stability levels
+#[stable(feature = "a", since = "b")] //~ ERROR multiple stability levels [E0544]
+fn multiple3() { }
 
 #[stable(feature = "a", since = "b")]
 #[rustc_deprecated(since = "b", reason = "text")]
 #[rustc_deprecated(since = "b", reason = "text")]
-fn multiple4() { } //~ ERROR multiple rustc_deprecated attributes
+fn multiple4() { } //~ ERROR multiple rustc_deprecated attributes [E0540]
 //~^ ERROR Invalid stability or deprecation version found
 
 #[rustc_deprecated(since = "a", reason = "text")]
-fn deprecated_without_unstable_or_stable() { } //~ ERROR rustc_deprecated attribute must be paired
+fn deprecated_without_unstable_or_stable() { }
+//~^ ERROR rustc_deprecated attribute must be paired with either stable or unstable attribute
 
 fn main() { }