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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:02:58 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:02:58 +0000
commit698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch)
tree173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/functions-closures/closure-to-fn-coercion.rs
parentInitial commit. (diff)
downloadrustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz
rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/functions-closures/closure-to-fn-coercion.rs')
-rw-r--r--src/test/ui/functions-closures/closure-to-fn-coercion.rs35
1 files changed, 35 insertions, 0 deletions
diff --git a/src/test/ui/functions-closures/closure-to-fn-coercion.rs b/src/test/ui/functions-closures/closure-to-fn-coercion.rs
new file mode 100644
index 000000000..87ba488b5
--- /dev/null
+++ b/src/test/ui/functions-closures/closure-to-fn-coercion.rs
@@ -0,0 +1,35 @@
+// run-pass
+use std::mem;
+
+const FOO: fn(u8) -> u8 = |v: u8| { v };
+
+const BAR: [fn(&mut u32); 5] = [
+ |_: &mut u32| {},
+ |v: &mut u32| *v += 1,
+ |v: &mut u32| *v += 2,
+ |v: &mut u32| *v += 3,
+ |v: &mut u32| *v += 4,
+];
+fn func_specific() -> fn() -> u32 {
+ || return 42
+}
+
+fn generic<T>(_: T) -> fn() -> usize {
+ || mem::size_of::<T>()
+}
+
+fn main() {
+ // Items
+ assert_eq!(func_specific()(), 42);
+ let foo: fn(u8) -> u8 = |v: u8| { v };
+ assert_eq!(foo(31), 31);
+ // Constants
+ assert_eq!(FOO(31), 31);
+ let mut a: u32 = 0;
+ assert_eq!({ BAR[0](&mut a); a }, 0);
+ assert_eq!({ BAR[1](&mut a); a }, 1);
+ assert_eq!({ BAR[2](&mut a); a }, 3);
+ assert_eq!({ BAR[3](&mut a); a }, 6);
+ assert_eq!({ BAR[4](&mut a); a }, 10);
+ assert_eq!(generic(0i8)(), 1);
+}