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Add more debugging to syntax::feature_gate.

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This commit is contained in:
Huon Wilson 2015-03-04 18:10:54 +11:00
parent ab7ef7402b
commit 10426f69da
1 changed files with 6 additions and 2 deletions
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8
src/libsyntax/feature_gate.rs
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@ -285,7 +285,7 @@ pub const KNOWN_ATTRIBUTES: &'static [(&'static str, AttributeType)] = &[
("recursion_limit", CrateLevel),
];
#[derive(PartialEq, Copy)]
#[derive(PartialEq, Copy, Debug)]
pub enum AttributeType {
/// Normal, builtin attribute that is consumed
/// by the compiler before the unused_attribute check
@ -353,7 +353,9 @@ struct Context<'a> {
impl<'a> Context<'a> {
fn gate_feature(&self, feature: &str, span: Span, explain: &str) {
if !self.has_feature(feature) {
let has_feature = self.has_feature(feature);
debug!("gate_feature(feature = {:?}, span = {:?}); has? {}", feature, span, has_feature);
if !has_feature {
emit_feature_err(self.span_handler, feature, span, explain);
}
}
@ -634,12 +636,14 @@ impl<'a, 'v> Visitor<'v> for PostExpansionVisitor<'a> {
}
fn visit_attribute(&mut self, attr: &ast::Attribute) {
debug!("visit_attribute(attr = {:?})", attr);
let name = &*attr.name();
for &(n, ty) in KNOWN_ATTRIBUTES {
if n == name {
if let Gated(gate, desc) = ty {
self.gate_feature(gate, attr.span, desc);
}
debug!("visit_attribute: {:?} is known, {:?}", name, ty);
return;
}
}