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Fix ICE due to normalization failure

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This commit is contained in:
Yuki Okushi 2019-12-31 15:43:21 +09:00
parent d9e38f57c1
commit f922812541
1 changed files with 12 additions and 2 deletions
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14
clippy_lints/src/transmute.rs
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@ -639,8 +639,18 @@ fn get_type_snippet(cx: &LateContext<'_, '_>, path: &QPath<'_>, to_ref_ty: Ty<'_
// check if the component types of the transmuted collection and the result have different ABI,
// size or alignment
fn is_layout_incompatible<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, from: Ty<'tcx>, to: Ty<'tcx>) -> bool {
let from_ty_layout = cx.tcx.layout_of(ty::ParamEnv::empty().and(from));
let to_ty_layout = cx.tcx.layout_of(ty::ParamEnv::empty().and(to));
let empty_param_env = ty::ParamEnv::empty();
// check if `from` and `to` are normalizable to avoid ICE (#4968)
let is_normalizable = cx.tcx.infer_ctxt().enter(|infcx| {
let cause = rustc::traits::ObligationCause::dummy();
infcx.at(&cause, empty_param_env).normalize(&from).is_ok()
&& infcx.at(&cause, empty_param_env).normalize(&to).is_ok()
});
if !is_normalizable {
return false;
}
let from_ty_layout = cx.tcx.layout_of(empty_param_env.and(from));
let to_ty_layout = cx.tcx.layout_of(empty_param_env.and(to));
if let (Ok(from_layout), Ok(to_layout)) = (from_ty_layout, to_ty_layout) {
from_layout.size != to_layout.size || from_layout.align != to_layout.align || from_layout.abi != to_layout.abi
} else {