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Don't panic if traits not found

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This commit is contained in:
Andre Bogus 2017-03-16 08:57:17 +01:00
parent bed96fb3da
commit c2ff30375a
1 changed files with 7 additions and 3 deletions
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10
clippy_lints/src/needless_pass_by_value.rs
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@ -41,6 +41,10 @@ impl LintPass for NeedlessPassByValue {
}
}
macro_rules! need {
($e: expr) => { if let Some(x) = $e { x } else { return; } };
}
impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NeedlessPassByValue {
fn check_fn(
&mut self,
@ -60,9 +64,9 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NeedlessPassByValue {
}
// Allows these to be passed by value.
let fn_trait = cx.tcx.lang_items.fn_trait().expect("failed to find `Fn` trait");
let asref_trait = get_trait_def_id(cx, &paths::ASREF_TRAIT).expect("failed to find `AsRef` trait");
let borrow_trait = get_trait_def_id(cx, &paths::BORROW_TRAIT).expect("failed to find `Borrow` trait");
let fn_trait = need!(cx.tcx.lang_items.fn_trait());
let asref_trait = need!(get_trait_def_id(cx, &paths::ASREF_TRAIT));
let borrow_trait = need!(get_trait_def_id(cx, &paths::BORROW_TRAIT));
let preds: Vec<ty::Predicate> = {
let parameter_env = ty::ParameterEnvironment::for_item(cx.tcx, node_id);