diff options
Diffstat (limited to 'src/libsyntax/ext/tt/macro_rules.rs')
| -rw-r--r-- | src/libsyntax/ext/tt/macro_rules.rs | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/src/libsyntax/ext/tt/macro_rules.rs b/src/libsyntax/ext/tt/macro_rules.rs index 33ea675f9d1..cc5531c4010 100644 --- a/src/libsyntax/ext/tt/macro_rules.rs +++ b/src/libsyntax/ext/tt/macro_rules.rs @@ -376,7 +376,24 @@ pub fn compile( }); if body.legacy { - let allow_internal_unstable = attr::contains_name(&def.attrs, "allow_internal_unstable"); + let allow_internal_unstable = attr::find_by_name(&def.attrs, "allow_internal_unstable") + .map(|attr| attr + .meta_item_list() + .map(|list| list.iter() + .map(|it| it.name().unwrap_or_else(|| sess.span_diagnostic.span_bug( + it.span, "allow internal unstable expects feature names", + ))) + .collect::<Vec<Symbol>>().into() + ) + .unwrap_or_else(|| { + sess.span_diagnostic.span_warn( + attr.span, "allow_internal_unstable expects list of feature names. In the \ + future this will become a hard error. Please use `allow_internal_unstable(\ + foo, bar)` to only allow the `foo` and `bar` features", + ); + vec![Symbol::intern("allow_internal_unstable_backcompat_hack")].into() + }) + ); let allow_internal_unsafe = attr::contains_name(&def.attrs, "allow_internal_unsafe"); let mut local_inner_macros = false; if let Some(macro_export) = attr::find_by_name(&def.attrs, "macro_export") { |