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Add long error explanation for E0556

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GuillaumeGomez committed Oct 3, 2019
1 parent 42ec683 commit e86af1bbeb610423a4d6c56e6da5ceb411d6b53c
Showing with 19 additions and 1 deletion.
  1. +19 −1 src/libsyntax/error_codes.rs
@@ -208,6 +208,25 @@ If you need the feature, make sure to use a nightly release of the compiler
(but be warned that the feature may be removed or altered in the future).
"##,

E0556: r##"
The `feature` attribute was badly formed.
Erroneous code example:
```compile_fail,E0556
#![feature(foo_bar_baz, foo(bar), foo = "baz", foo)] // error!
#![feature] // error!
#![feature = "foo"] // error!
```
The `feature` attribute only accept a "feature flag" and can only be used on
nightly. Example:
```ignore (only works in nightly)
#![feature(flag)]
```
"##,

E0557: r##"
A feature attribute named a feature that has been removed.
@@ -457,7 +476,6 @@ features in the `-Z allow_features` flag.
E0551, // incorrect meta item
E0553, // multiple rustc_const_unstable attributes
// E0555, // replaced with a generic attribute input check
E0556, // malformed feature, expected just one word
E0584, // file for module `..` found at both .. and ..
E0629, // missing 'feature' (rustc_const_unstable)
// rustc_const_unstable attribute must be paired with stable/unstable

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