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Make type_implements_trait not a query

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This commit is contained in:
Aman Arora 2021-07-06 05:38:15 -04:00
parent 26e57f05cc
commit f0f3b3acf8
1 changed files with 8 additions and 6 deletions
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14
clippy_utils/src/ty.rs
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@ -15,6 +15,7 @@ use rustc_span::sym;
use rustc_span::symbol::{Ident, Symbol};
use rustc_span::DUMMY_SP;
use rustc_trait_selection::traits::query::normalize::AtExt;
use rustc_trait_selection::infer::InferCtxtExt;
use crate::{match_def_path, must_use_attr};
@ -112,6 +113,7 @@ pub fn has_iter_method(cx: &LateContext<'_>, probably_ref_ty: Ty<'_>) -> Option<
}
/// Checks whether a type implements a trait.
/// The function returns false in case the type contains an inference variable.
/// See also `get_trait_def_id`.
pub fn implements_trait<'tcx>(
cx: &LateContext<'tcx>,
@ -119,18 +121,18 @@ pub fn implements_trait<'tcx>(
trait_id: DefId,
ty_params: &[GenericArg<'tcx>],
) -> bool {
// Do not check on infer_types to avoid panic in evaluate_obligation.
if ty.has_infer_types() {
return false;
}
// Clippy shouldn't have infer types
assert!(!ty.needs_infer());
let ty = cx.tcx.erase_regions(ty);
if ty.has_escaping_bound_vars() {
return false;
}
let ty_params = cx.tcx.mk_substs(ty_params.iter());
cx.tcx
.type_implements_trait((trait_id, ty, ty_params, cx.param_env))
cx.tcx.infer_ctxt().enter(|infcx|
infcx.type_implements_trait(trait_id, ty, ty_params, cx.param_env)
.must_apply_modulo_regions()
)
}
/// Checks whether this type implements `Drop`.