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better ObligationCause for normalization errors in can_type_implement_copy

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This commit is contained in:
Michael Goulet 2022-02-06 13:03:28 -08:00
parent 3d127e2040
commit 8ba74369c2
8 changed files with 71 additions and 22 deletions
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4
compiler/rustc_trait_selection/src/traits/misc.rs
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@ -20,6 +20,7 @@ pub fn can_type_implement_copy<'tcx>(
tcx: TyCtxt<'tcx>,
param_env: ty::ParamEnv<'tcx>,
self_type: Ty<'tcx>,
cause: ObligationCause<'tcx>,
) -> Result<(), CopyImplementationError<'tcx>> {
// FIXME: (@jroesch) float this code up
tcx.infer_ctxt().enter(|infcx| {
@ -49,9 +50,8 @@ pub fn can_type_implement_copy<'tcx>(
continue;
}
let span = tcx.def_span(field.did);
let cause = ObligationCause::dummy_with_span(span);
let ctx = traits::FulfillmentContext::new();
match traits::fully_normalize(&infcx, ctx, cause, param_env, ty) {
match traits::fully_normalize(&infcx, ctx, cause.clone(), param_env, ty) {
Ok(ty) => {
if !infcx.type_is_copy_modulo_regions(param_env, ty, span) {
infringing.push(field);