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80 lines
1.9 KiB
Rust
80 lines
1.9 KiB
Rust
#![feature(never_type)]
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fn foo(x: usize, y: !, z: usize) { }
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fn call_foo_a() {
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foo(return, 22, 44);
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//~^ ERROR mismatched types
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}
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fn call_foo_b() {
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// Divergence happens in the argument itself, definitely ok.
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foo(22, return, 44);
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}
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fn call_foo_c() {
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// This test fails because the divergence happens **after** the
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// coercion to `!`:
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foo(22, 44, return); //~ ERROR mismatched types
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}
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fn call_foo_d() {
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// This test passes because `a` has type `!`:
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let a: ! = return;
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let b = 22;
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let c = 44;
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foo(a, b, c); // ... and hence a reference to `a` is expected to diverge.
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//~^ ERROR mismatched types
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}
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fn call_foo_e() {
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// This test probably could pass but we don't *know* that `a`
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// has type `!` so we don't let it work.
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let a = return;
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let b = 22;
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let c = 44;
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foo(a, b, c); //~ ERROR mismatched types
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}
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fn call_foo_f() {
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// This fn fails because `a` has type `usize`, and hence a
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// reference to is it **not** considered to diverge.
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let a: usize = return;
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let b = 22;
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let c = 44;
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foo(a, b, c); //~ ERROR mismatched types
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}
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fn array_a() {
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// Return is coerced to `!` just fine, but `22` cannot be.
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let x: [!; 2] = [return, 22]; //~ ERROR mismatched types
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}
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fn array_b() {
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// Error: divergence has not yet occurred.
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let x: [!; 2] = [22, return]; //~ ERROR mismatched types
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}
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fn tuple_a() {
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// No divergence at all.
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let x: (usize, !, usize) = (22, 44, 66); //~ ERROR mismatched types
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}
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fn tuple_b() {
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// Divergence happens before coercion: OK
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let x: (usize, !, usize) = (return, 44, 66);
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//~^ ERROR mismatched types
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}
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fn tuple_c() {
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// Divergence happens before coercion: OK
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let x: (usize, !, usize) = (22, return, 66);
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}
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fn tuple_d() {
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// Error: divergence happens too late
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let x: (usize, !, usize) = (22, 44, return); //~ ERROR mismatched types
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}
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fn main() { }
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