bjoernager/rust
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Deduplicate the "needs partialeq derive" message creation sites

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This commit is contained in:
Oliver Scherer 2020-09-24 10:18:51 +02:00
parent e4928d77a1
commit 9550ca6242
1 changed files with 13 additions and 21 deletions
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34
compiler/rustc_mir_build/src/thir/pattern/const_to_pat.rs
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@ -3,7 +3,7 @@ use rustc_index::vec::Idx;
use rustc_infer::infer::{InferCtxt, TyCtxtInferExt};
use rustc_middle::mir::Field;
use rustc_middle::ty::print::with_no_trimmed_paths;
use rustc_middle::ty::{self, Ty, TyCtxt};
use rustc_middle::ty::{self, AdtDef, Ty, TyCtxt};
use rustc_session::lint;
use rustc_span::Span;
use rustc_trait_selection::traits::predicate_for_trait_def;
@ -89,18 +89,20 @@ impl<'a, 'tcx> ConstToPat<'a, 'tcx> {
self.infcx.tcx
}
fn adt_derive_msg(&self, adt_def: &AdtDef) -> String {
let path = self.tcx().def_path_str(adt_def.did);
format!(
"to use a constant of type `{}` in a pattern, \
`{}` must be annotated with `#[derive(PartialEq, Eq)]`",
path, path,
)
}
fn search_for_structural_match_violation(&self, ty: Ty<'tcx>) -> Option<String> {
traits::search_for_structural_match_violation(self.id, self.span, self.tcx(), ty).map(
|non_sm_ty| {
with_no_trimmed_paths(|| match non_sm_ty {
traits::NonStructuralMatchTy::Adt(adt_def) => {
let path = self.tcx().def_path_str(adt_def.did);
format!(
"to use a constant of type `{}` in a pattern, \
`{}` must be annotated with `#[derive(PartialEq, Eq)]`",
path, path,
)
}
traits::NonStructuralMatchTy::Adt(adt) => self.adt_derive_msg(adt),
traits::NonStructuralMatchTy::Dynamic => {
"trait objects cannot be used in patterns".to_string()
}
@ -412,12 +414,7 @@ impl<'a, 'tcx> ConstToPat<'a, 'tcx> {
&& !self.saw_const_match_lint.get()
{
self.saw_const_match_lint.set(true);
let path = self.tcx().def_path_str(adt_def.did);
let msg = format!(
"to use a constant of type `{}` in a pattern, \
`{}` must be annotated with `#[derive(PartialEq, Eq)]`",
path, path,
);
let msg = self.adt_derive_msg(adt_def);
self.tcx().struct_span_lint_hir(
lint::builtin::INDIRECT_STRUCTURAL_MATCH,
self.id,
@ -429,12 +426,7 @@ impl<'a, 'tcx> ConstToPat<'a, 'tcx> {
} else {
if !self.saw_const_match_error.get() {
self.saw_const_match_error.set(true);
let path = self.tcx().def_path_str(adt_def.did);
let msg = format!(
"to use a constant of type `{}` in a pattern, \
`{}` must be annotated with `#[derive(PartialEq, Eq)]`",
path, path,
);
let msg = self.adt_derive_msg(adt_def);
if self.include_lint_checks {
tcx.sess.span_err(span, &msg);
} else {