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Rollup merge of #77160 - ecstatic-morse:const-fn-transmute-suggestion, r=oli-obk

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Suggest `const_fn_transmute`, not `const_fn`

More fallout from #76850 in the vein of #77134. The fix is the same. I looked through the structured errors file and didn't see any more of this kind of diagnostics bug.

r? @oli-obk
This commit is contained in:
Jonas Schievink 2020-09-25 02:29:49 +02:00 • committed by GitHub
commit b8d158b0f8
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5 changed files with 60 additions and 43 deletions
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9
compiler/rustc_mir/src/transform/check_consts/ops.rs
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@ -489,7 +489,14 @@ impl NonConstOp for Transmute {
}
fn emit_error(&self, ccx: &ConstCx<'_, '_>, span: Span) {
mcf_emit_error(ccx, span, "can only call `transmute` from const items, not `const fn`");
feature_err(
&ccx.tcx.sess.parse_sess,
sym::const_fn_transmute,
span,
&format!("`transmute` is not allowed in {}s", ccx.const_kind()),
)
.note("`transmute` is only allowed in constants and statics for now")
.emit();
}
}