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Attribute values must be literals. The error you get when that doesn't hold is pretty bad, e.g.: ``` unexpected expression: 1 + 1 ``` You also get the same error if the attribute value is a literal, but an invalid literal, e.g.: ``` unexpected expression: "foo"suffix ``` This commit does two things. - Changes the error message to "attribute value must be a literal", which gives a better idea of what the problem is and how to fix it. It also no longer prints the invalid expression, because the carets below highlight it anyway. - Separates the "not a literal" case from the "invalid literal" case. Which means invalid literals now get the specific error at the literal level, rather than at the attribute level.
17 lines
370 B
Rust
17 lines
370 B
Rust
#![feature(rustc_attrs)]
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macro_rules! check {
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($expr: expr) => (
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#[rustc_dummy = $expr]
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use main as _;
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);
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}
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check!("0"); // OK
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check!(0); // OK
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check!(0u8); //~ ERROR suffixed literals are not allowed in attributes
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check!(-0); //~ ERROR attribute value must be a literal
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check!(0 + 0); //~ ERROR attribute value must be a literal
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fn main() {}
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