19 lines
601 B
Rust
19 lines
601 B
Rust
use rustc_middle::ty::TyCtxt;
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use rustc_span::symbol::sym;
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use crate::errors;
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pub fn test_variance(tcx: TyCtxt<'_>) {
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// For unit testing: check for a special "rustc_variance"
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// attribute and report an error with various results if found.
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for id in tcx.hir().items() {
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if tcx.has_attr(id.owner_id, sym::rustc_variance) {
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let variances_of = tcx.variances_of(id.owner_id);
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tcx.sess.emit_err(errors::VariancesOf {
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span: tcx.def_span(id.owner_id),
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variances_of: format!("{variances_of:?}"),
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});
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}
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}
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}
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