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Add const_generics feature flag

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Co-Authored-By: Gabriel Smith <yodaldevoid@users.noreply.github.com>
This commit is contained in:
varkor 2019-02-05 16:49:10 +01:00
parent 751dcdf606
commit 8d83521f0b
1 changed files with 13 additions and 2 deletions
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15
src/libsyntax/feature_gate.rs
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@ -15,7 +15,7 @@
use AttributeType::*;
use AttributeGate::*;
use crate::ast::{self, NodeId, PatKind, RangeEnd};
use crate::ast::{self, NodeId, GenericParam, GenericParamKind, PatKind, RangeEnd};
use crate::attr;
use crate::early_buffered_lints::BufferedEarlyLintId;
use crate::source_map::Spanned;
@ -462,6 +462,9 @@ declare_features! (
// Re-Rebalance coherence
(active, re_rebalance_coherence, "1.32.0", Some(55437), None),
// Const generic types.
(active, const_generics, "1.34.0", Some(44580), None),
// #[optimize(X)]
(active, optimize_attribute, "1.34.0", Some(54882), None),
@ -1899,6 +1902,14 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
visit::walk_fn(self, fn_kind, fn_decl, span);
}
fn visit_generic_param(&mut self, param: &'a GenericParam) {
if let GenericParamKind::Const { .. } = param.kind {
gate_feature_post!(&self, const_generics, param.ident.span,
"const generics are unstable");
}
visit::walk_generic_param(self, param);
}
fn visit_trait_item(&mut self, ti: &'a ast::TraitItem) {
match ti.node {
ast::TraitItemKind::Method(ref sig, ref block) => {
@ -1984,7 +1995,7 @@ pub fn get_features(span_handler: &Handler, krate_attrs: &[ast::Attribute],
// Some features are known to be incomplete and using them is likely to have
// unanticipated results, such as compiler crashes. We warn the user about these
// to alert them.
let incomplete_features = ["generic_associated_types"];
let incomplete_features = ["generic_associated_types", "const_generics"];
let mut features = Features::new();
let mut edition_enabled_features = FxHashMap::default();