Add ergonomic_clones feature flag
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@ -489,6 +489,7 @@ pub fn check_crate(krate: &ast::Crate, sess: &Session, features: &Features) {
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gate_all!(dyn_star, "`dyn*` trait objects are experimental");
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gate_all!(const_closures, "const closures are experimental");
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gate_all!(builtin_syntax, "`builtin #` syntax is unstable");
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gate_all!(ergonomic_clones, "`.use` calls are experimental");
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gate_all!(explicit_tail_calls, "`become` expression is experimental");
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gate_all!(generic_const_items, "generic const items are experimental");
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gate_all!(guard_patterns, "guard patterns are experimental", "consider using match arm guards");
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