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https://github.com/rust-lang/rust
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6289ed8428
and replace it with a simple note suggesting returning a value. The type mismatch error was never due to how many times the loop iterates. It is more because of the peculiar structure of what the for loop desugars to. So the note talking about iteration count didn't make sense
111 lines
2.1 KiB
Rust
111 lines
2.1 KiB
Rust
// Regression test for #122561
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fn for_infinite() -> bool {
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for i in 0.. {
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//~^ ERROR mismatched types
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return false;
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}
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}
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fn for_finite() -> String {
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for i in 0..5 {
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//~^ ERROR mismatched types
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return String::from("test");
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}
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}
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fn for_zero_times() -> bool {
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for i in 0..0 {
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//~^ ERROR mismatched types
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return true;
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}
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}
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fn for_never_type() -> ! {
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for i in 0..5 {
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//~^ ERROR mismatched types
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}
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}
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// Entire function on a single line.
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// Tests that we format the suggestion
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// correctly in this case
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fn for_single_line() -> bool { for i in 0.. { return false; } }
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//~^ ERROR mismatched types
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// Loop in an anon const in function args
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// Tests that we:
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// a. deal properly with this complex case
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// b. format the suggestion correctly so
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// that it's readable
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fn for_in_arg(a: &[(); for x in 0..2 {}]) -> bool {
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//~^ ERROR `for` is not allowed in a `const`
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//~| ERROR mismatched types
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true
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}
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fn while_inifinite() -> bool {
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while true {
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//~^ ERROR mismatched types
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//~| WARN denote infinite loops with `loop { ... }` [while_true]
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return true;
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}
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}
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fn while_finite() -> bool {
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let mut i = 0;
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while i < 3 {
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//~^ ERROR mismatched types
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i += 1;
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return true;
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}
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}
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fn while_zero_times() -> bool {
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while false {
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//~^ ERROR mismatched types
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return true;
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}
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}
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fn while_never_type() -> ! {
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while true {
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//~^ ERROR mismatched types
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//~| WARN denote infinite loops with `loop { ... }` [while_true]
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}
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}
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// No type mismatch error in this case
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fn loop_() -> bool {
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loop {
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return true;
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}
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}
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const C: i32 = {
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for i in 0.. {
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//~^ ERROR `for` is not allowed in a `const`
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//~| ERROR mismatched types
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}
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};
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fn main() {
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let _ = [10; {
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for i in 0..5 {
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//~^ ERROR `for` is not allowed in a `const`
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//~| ERROR mismatched types
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}
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}];
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let _ = [10; {
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while false {
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//~^ ERROR mismatched types
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}
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}];
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let _ = |a: &[(); for x in 0..2 {}]| {};
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//~^ ERROR `for` is not allowed in a `const`
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//~| ERROR mismatched types
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}
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