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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/rfcs/rfc-2528-type-changing-struct-update/type-generic-update.rs | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/src/test/ui/rfcs/rfc-2528-type-changing-struct-update/type-generic-update.rs b/src/test/ui/rfcs/rfc-2528-type-changing-struct-update/type-generic-update.rs new file mode 100644 index 000000000..dae1241d3 --- /dev/null +++ b/src/test/ui/rfcs/rfc-2528-type-changing-struct-update/type-generic-update.rs @@ -0,0 +1,56 @@ +#![feature(type_changing_struct_update)] +#![allow(incomplete_features)] + +struct Machine<'a, S, M> { + state: S, + message: M, + lt_str: &'a str, + common_field: i32, +} + +struct State1; +struct State2; + +struct Message1; +struct Message2; + +fn update() { + let m1: Machine<State1, Message1> = Machine { + state: State1, + message: Message1, + lt_str: "hello", + common_field: 2, + }; + // single type update + let m2: Machine<State2, Message1> = Machine { + state: State2, + ..m1 + }; + // multiple type update + let m3: Machine<State2, Message2> = Machine { + state: State2, + message: Message2, + ..m1 + }; +} + +fn fail_update() { + let m1: Machine<f64, f64> = Machine { + state: 3.2, + message: 6.4, + lt_str: "hello", + common_field: 2, + }; + // single type update fail + let m2: Machine<i32, f64> = Machine { + ..m1 + //~^ ERROR mismatched types [E0308] + }; + // multiple type update fail + let m3 = Machine::<i32, i32> { + ..m1 + //~^ ERROR mismatched types [E0308] + }; +} + +fn main() {} |