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40ae34194c
detects redundant imports that can be eliminated. for #117772 : In order to facilitate review and modification, split the checking code and removing redundant imports code into two PR.
77 lines
1.3 KiB
Rust
77 lines
1.3 KiB
Rust
// run-pass
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#![feature(lang_items, unboxed_closures, fn_traits)]
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struct S1 {
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x: i32,
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y: i32,
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}
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impl FnMut<(i32,)> for S1 {
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extern "rust-call" fn call_mut(&mut self, (z,): (i32,)) -> i32 {
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self.x * self.y * z
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}
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}
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impl FnOnce<(i32,)> for S1 {
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type Output = i32;
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extern "rust-call" fn call_once(mut self, args: (i32,)) -> i32 {
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self.call_mut(args)
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}
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}
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struct S2 {
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x: i32,
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y: i32,
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}
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impl Fn<(i32,)> for S2 {
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extern "rust-call" fn call(&self, (z,): (i32,)) -> i32 {
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self.x * self.y * z
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}
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}
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impl FnMut<(i32,)> for S2 {
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extern "rust-call" fn call_mut(&mut self, args: (i32,)) -> i32 { self.call(args) }
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}
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impl FnOnce<(i32,)> for S2 {
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type Output = i32;
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extern "rust-call" fn call_once(self, args: (i32,)) -> i32 { self.call(args) }
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}
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struct S3 {
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x: i32,
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y: i32,
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}
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impl FnOnce<(i32,i32)> for S3 {
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type Output = i32;
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extern "rust-call" fn call_once(self, (z,zz): (i32,i32)) -> i32 {
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self.x * self.y * z * zz
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}
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}
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fn main() {
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let mut s = S1 {
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x: 3,
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y: 3,
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};
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let ans = s(3);
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assert_eq!(ans, 27);
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let s = S2 {
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x: 3,
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y: 3,
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};
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let ans = s.call((3,));
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assert_eq!(ans, 27);
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let s = S3 {
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x: 3,
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y: 3,
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};
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let ans = s(3, 1);
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assert_eq!(ans, 27);
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}
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