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Forbid generator-specific MIR in all const-contexts

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This commit is contained in:
Dylan MacKenzie
2020-09-29 19:20:05 -07:00
parent c38aca0502
commit 20e07e7b8e
1 changed files with 3 additions and 5 deletions
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8
compiler/rustc_mir/src/transform/check_consts/ops.rs
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@@ -216,14 +216,12 @@ impl NonConstOp for FnPtrCast {
#[derive(Debug)]
pub struct Generator;
impl NonConstOp for Generator {
fn status_in_item(&self, ccx: &ConstCx<'_, '_>) -> Status {
// FIXME: This means generator-only MIR is only forbidden in const fn. This is for
// compatibility with the old code. Such MIR should be forbidden everywhere.
mcf_status_in_item(ccx)
fn status_in_item(&self, _: &ConstCx<'_, '_>) -> Status {
Status::Forbidden
}
fn emit_error(&self, ccx: &ConstCx<'_, '_>, span: Span) {
mcf_emit_error(ccx, span, "const fn generators are unstable");
ccx.tcx.sess.struct_span_err(span, "Generators and `async` functions cannot be `const`").emit();
}
}