rust/tests/ui/proc-macro/issue-81543-item-parse-err.rs

// aux-build:test-macros.rs

// Regression test for issue #81543
// Tests that we emit a properly spanned error
// when the output of a proc-macro cannot be parsed
// as the expected AST node kind

extern crate test_macros;

test_macros::identity! {
    fn 32() {} //~ ERROR expected identifier
}

fn main() {}
Improve handling of spans around macro result parse errors Fixes #81543 After we expand a macro, we try to parse the resulting tokens as a AST node. This commit makes several improvements to how we handle spans when an error occurs: * Only ovewrite the original `Span` if it's a dummy span. This preserves a more-specific span if one is available. * Use `self.prev_token` instead of `self.token` when emitting an error message after encountering EOF, since an EOF token always has a dummy span * Make `SourceMap::next_point` leave dummy spans unused. A dummy span does not have a logical 'next point', since it's a zero-length span. Re-using the span span preserves its 'dummy-ness' for other checks 2021-01-31 20:21:28 +00:00			`// aux-build:test-macros.rs`

			`// Regression test for issue #81543`
			`// Tests that we emit a properly spanned error`
			`// when the output of a proc-macro cannot be parsed`
			`// as the expected AST node kind`

			`extern crate test_macros;`

			`test_macros::identity! {`
			`fn 32() {} //~ ERROR expected identifier`
			`}`

			`fn main() {}`