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-rw-r--r--crates/ra_hir_ty/src/tests/traits.rs68
1 files changed, 68 insertions, 0 deletions
diff --git a/crates/ra_hir_ty/src/tests/traits.rs b/crates/ra_hir_ty/src/tests/traits.rs
index 8efe05877..dd5bdd2d0 100644
--- a/crates/ra_hir_ty/src/tests/traits.rs
+++ b/crates/ra_hir_ty/src/tests/traits.rs
@@ -3043,3 +3043,71 @@ fn infer_box_fn_arg() {
3043 "### 3043 "###
3044 ); 3044 );
3045} 3045}
3046
3047#[test]
3048fn infer_dyn_fn_output() {
3049 assert_snapshot!(
3050 infer(
3051 r#"
3052 //- /lib.rs deps:std
3053
3054 #[lang = "fn_once"]
3055 pub trait FnOnce<Args> {
3056 type Output;
3057
3058 extern "rust-call" fn call_once(self, args: Args) -> Self::Output;
3059 }
3060
3061 #[lang = "fn"]
3062 pub trait Fn<Args>:FnOnce<Args> {
3063 extern "rust-call" fn call(&self, args: Args) -> Self::Output;
3064 }
3065
3066 #[lang = "deref"]
3067 pub trait Deref {
3068 type Target: ?Sized;
3069
3070 fn deref(&self) -> &Self::Target;
3071 }
3072
3073 #[lang = "owned_box"]
3074 pub struct Box<T: ?Sized> {
3075 inner: *mut T,
3076 }
3077
3078 impl<T: ?Sized> Deref for Box<T> {
3079 type Target = T;
3080
3081 fn deref(&self) -> &T {
3082 &self.inner
3083 }
3084 }
3085
3086 fn foo() {
3087 let f: Box<dyn Fn() -> i32> = box(|| 5);
3088 let x = f();
3089 }
3090 "#
3091 ),
3092 @r###"
3093 182..186 'self': Self
3094 188..192 'args': Args
3095 349..353 'self': &Self
3096 355..359 'args': Args
3097 523..527 'self': &Self
3098 789..793 'self': &Box<T>
3099 801..852 '{ ... }': &T
3100 823..834 '&self.inner': &*mut T
3101 824..828 'self': &Box<T>
3102 824..834 'self.inner': *mut T
3103 889..990 '{ ... }': ()
3104 911..912 'f': Box<dyn Fn<(), Output = i32>>
3105 937..946 'box(|| 5)': Box<|| -> i32>
3106 941..945 '|| 5': || -> i32
3107 944..945 '5': i32
3108 968..969 'x': i32
3109 972..973 'f': Box<dyn Fn<(), Output = i32>>
3110 972..975 'f()': i32
3111 "###
3112 );
3113}