mirror of https://github.com/rust-lang/rust
43 lines
1.9 KiB
Rust
43 lines
1.9 KiB
Rust
//@ edition: 2021
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// The null char check for C string literals was originally implemented after
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// expansion, which meant the first five strings in this file triggered errors,
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// and the remaining ten did not. But this is different to all the other
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// content checks done on string literals, such as checks for invalid escapes
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// and bare CR chars. So the check was moved earlier. The check can be moved
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// back to after expansion at a later date if necessary, because that would be
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// a backward compatible change. (In contrast, moving the check from after
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// expansion to lexing time would be a backward incompatible change, because it
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// could break code that was previously accepted.)
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fn main() {
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c"\0"; //~ ERROR null characters in C string literals
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c"\u{00}"; //~ ERROR null characters in C string literals
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c" "; //~ ERROR null characters in C string literals
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c"\x00"; //~ ERROR null characters in C string literals
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cr" "; //~ ERROR null characters in C string literals
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}
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macro_rules! empty {
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($($tt:tt)*) => {};
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}
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// The cfg does not consume the literals before nul checking occurs.
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#[cfg(FALSE)]
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fn test() {
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c"\0"; //~ ERROR null characters in C string literals
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c"\u{00}"; //~ ERROR null characters in C string literals
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c" "; //~ ERROR null characters in C string literals
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c"\x00"; //~ ERROR null characters in C string literals
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cr" "; //~ ERROR null characters in C string literals
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}
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// The macro does not consume the literals before nul checking occurs.
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fn test_empty() {
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empty!(c"\0"); //~ ERROR null characters in C string literals
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empty!(c"\u{00}"); //~ ERROR null characters in C string literals
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empty!(c" "); //~ ERROR null characters in C string literals
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empty!(c"\x00"); //~ ERROR null characters in C string literals
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empty!(cr" "); //~ ERROR null characters in C string literals
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}
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