diff --git a/src/test/ui/type-alias-enum-variants/enum-variant-generic-args-pats-pass.rs b/src/test/ui/type-alias-enum-variants/enum-variant-generic-args-pats-pass.rs index faef1fab879d..af05dd1b7156 100644 --- a/src/test/ui/type-alias-enum-variants/enum-variant-generic-args-pats-pass.rs +++ b/src/test/ui/type-alias-enum-variants/enum-variant-generic-args-pats-pass.rs @@ -1,15 +1,23 @@ // run-pass +// Check that resolving, in the value namespace, to an `enum` variant +// through a type alias is well behaved in the presence of generics. +// We check for situations with: +// 1. a generic type `Alias`, we can type-apply `Alias` when referring to a variant. +// 2. a monotype `AliasFixed` of generic `Enum`, we can refer to variants +// and the type-application of `T` in `AliasFixed` is kept. + #![allow(irrefutable_let_patterns)] #[allow(dead_code)] -enum Enum { TSVariant(T), SVariant { v: T } } +enum Enum { TSVariant(T), SVariant { v: T }, UVariant } type Alias = Enum; type AliasFixed = Enum<()>; macro_rules! is_variant { (TSVariant, $expr:expr) => (is_variant!(@check TSVariant, (_), $expr)); (SVariant, $expr:expr) => (is_variant!(@check SVariant, { v: _ }, $expr)); + (UVariant, $expr:expr) => (is_variant!(@check UVariant, {}, $expr)); (@check $variant:ident, $matcher:tt, $expr:expr) => ( assert!(if let Enum::$variant::<()> $matcher = $expr { true } else { false }, "expr does not have correct type"); @@ -38,4 +46,15 @@ fn main() { is_variant!(SVariant, Alias::<()>::SVariant { v: () }); is_variant!(SVariant, AliasFixed::SVariant { v: () }); + + // Unit variant + + is_variant!(UVariant, Enum::UVariant); + is_variant!(UVariant, Enum::UVariant::<()>); + is_variant!(UVariant, Enum::<()>::UVariant); + + is_variant!(UVariant, Alias::UVariant); + is_variant!(UVariant, Alias::<()>::UVariant); + + is_variant!(UVariant, AliasFixed::UVariant); }