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Feature gate

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This commit is contained in:
est31 2017-02-23 21:35:12 +01:00
parent 1b9b322883
commit f753a6ef02
3 changed files with 17 additions and 1 deletions
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9
src/librustc_typeck/check/coercion.rs
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@ -74,6 +74,7 @@ use rustc::ty::error::TypeError;
use rustc::ty::relate::RelateResult;
use syntax::ast::NodeId;
use syntax::abi;
use syntax::feature_gate;
use util::common::indent;
use std::cell::RefCell;
@ -575,6 +576,14 @@ impl<'f, 'gcx, 'tcx> Coerce<'f, 'gcx, 'tcx> {
let node_id_a :NodeId = self.tcx.hir.as_local_node_id(def_id_a).unwrap();
match b.sty {
ty::TyFnPtr(_) if self.tcx.with_freevars(node_id_a, |v| v.is_empty()) => {
if !self.tcx.sess.features.borrow().closure_to_fn_coercion {
feature_gate::emit_feature_err(&self.tcx.sess.parse_sess,
"closure_to_fn_coercion",
self.cause.span,
feature_gate::GateIssue::Language,
feature_gate::CLOSURE_TO_FN_COERCION);
return self.unify_and_identity(a, b);
}
// We coerce the closure, which has fn type
// `extern "rust-call" fn((arg0,arg1,...)) -> _`
// to