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2620eb42d7
`rustc_span::symbol` defines some things that are re-exported from
`rustc_span`, such as `Symbol` and `sym`. But it doesn't re-export some
closely related things such as `Ident` and `kw`. So you can do `use
rustc_span::{Symbol, sym}` but you have to do `use
rustc_span::symbol::{Ident, kw}`, which is inconsistent for no good
reason.
This commit re-exports `Ident`, `kw`, and `MacroRulesNormalizedIdent`,
and changes many `rustc_span::symbol::` qualifiers in `compiler/` to
`rustc_span::`. This is a 200+ net line of code reduction, mostly
because many files with two `use rustc_span` items can be reduced to
one.
48 lines
1.4 KiB
Rust
48 lines
1.4 KiB
Rust
use std::fmt::Write;
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use rustc_hir::def_id::{CRATE_DEF_ID, LocalDefId};
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use rustc_middle::ty::{GenericArgs, TyCtxt};
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use rustc_span::sym;
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fn format_variances(tcx: TyCtxt<'_>, def_id: LocalDefId) -> String {
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let variances = tcx.variances_of(def_id);
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let generics = GenericArgs::identity_for_item(tcx, def_id);
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// 7 = 2-letter parameter + ": " + 1-letter variance + ", "
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let mut ret = String::with_capacity(2 + 7 * variances.len());
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ret.push('[');
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for (arg, variance) in generics.iter().zip(variances.iter()) {
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write!(ret, "{arg}: {variance:?}, ").unwrap();
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}
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// Remove trailing `, `.
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if !variances.is_empty() {
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ret.pop();
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ret.pop();
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}
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ret.push(']');
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ret
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}
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pub(crate) fn variances(tcx: TyCtxt<'_>) {
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let crate_items = tcx.hir_crate_items(());
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if tcx.has_attr(CRATE_DEF_ID, sym::rustc_variance_of_opaques) {
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for id in crate_items.opaques() {
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tcx.dcx().emit_err(crate::errors::VariancesOf {
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span: tcx.def_span(id),
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variances: format_variances(tcx, id),
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});
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}
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}
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for id in crate_items.free_items() {
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if !tcx.has_attr(id.owner_id, sym::rustc_variance) {
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continue;
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}
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tcx.dcx().emit_err(crate::errors::VariancesOf {
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span: tcx.def_span(id.owner_id),
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variances: format_variances(tcx, id.owner_id.def_id),
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});
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}
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}
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