diff options
Diffstat (limited to 'compiler/rustc_typeck/src/variance/test.rs')
-rw-r--r-- | compiler/rustc_typeck/src/variance/test.rs | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/compiler/rustc_typeck/src/variance/test.rs b/compiler/rustc_typeck/src/variance/test.rs new file mode 100644 index 000000000..2ba87db88 --- /dev/null +++ b/compiler/rustc_typeck/src/variance/test.rs @@ -0,0 +1,14 @@ +use rustc_errors::struct_span_err; +use rustc_middle::ty::TyCtxt; +use rustc_span::symbol::sym; + +pub fn test_variance(tcx: TyCtxt<'_>) { + // 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() { + if tcx.has_attr(id.def_id.to_def_id(), sym::rustc_variance) { + let variances_of = tcx.variances_of(id.def_id); + struct_span_err!(tcx.sess, tcx.def_span(id.def_id), E0208, "{:?}", variances_of).emit(); + } + } +} |