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Test variances of opaque captures

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This commit is contained in:
Michael Goulet 2023-08-08 19:59:44 +00:00
parent 32a9565223
commit 690bcc6619
7 changed files with 105 additions and 0 deletions
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15
compiler/rustc_hir_analysis/src/variance/test.rs
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@ -1,9 +1,24 @@
use rustc_hir::def::DefKind;
use rustc_hir::def_id::CRATE_DEF_ID;
use rustc_middle::ty::TyCtxt;
use rustc_span::symbol::sym;
use crate::errors;
pub fn test_variance(tcx: TyCtxt<'_>) {
if tcx.has_attr(CRATE_DEF_ID, sym::rustc_variance_of_opaques) {
for id in tcx.hir().items() {
if matches!(tcx.def_kind(id.owner_id), DefKind::OpaqueTy) {
let variances_of = tcx.variances_of(id.owner_id);
tcx.sess.emit_err(errors::VariancesOf {
span: tcx.def_span(id.owner_id),
variances_of: format!("{variances_of:?}"),
});
}
}
}
// For unit testing: check for a special "rustc_variance"
// attribute and report an error with various results if found.
for id in tcx.hir().items() {