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Fix chrono compile-fail due to empty param_env #2786

merged 1 commit into from May 21, 2018
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Just for now

@@ -200,8 +200,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NeedlessPassByValue {
let sugg = |db: &mut DiagnosticBuilder| {
if let ty::TypeVariants::TyAdt(def, ..) = ty.sty {
if let Some(span) = cx.tcx.hir.span_if_local(def.did) {
let param_env = ty::ParamEnv::empty();
if param_env.can_type_implement_copy(cx.tcx, ty).is_ok() {
if cx.param_env.can_type_implement_copy(cx.tcx, ty).is_ok() {
db.span_help(span, "consider marking this type as Copy");
@@ -0,0 +1,19 @@
#![allow(unused_variables, blacklisted_name, needless_pass_by_value, dead_code)]

// This should not compile-fail with:
// error[E0277]: the trait bound `T: Foo` is not satisfied
// See

trait Foo {
type Bar;

struct Baz<T: Foo> {
bar: T::Bar,

fn take<T: Foo>(baz: Baz<T>) {}

fn main() {}
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