rust/src/test/ui/assert-eq-trailing-comma.rs

// run-pass

fn main() {
    assert_eq!(1, 1,);
}
tests: Add missing run-pass annotations 2019-07-26 16:54:25 -05:00			`// run-pass`

improve error message when two-arg assert_eq! receives a trailing comma Previously, `assert_eq!(left, right,)` (respectively, `assert_ne!(left, right,)`; note the trailing comma) would result in a confusing "requires at least a format string argument" error. In reality, a format string is optional, but the trailing comma puts us into the "match a token tree of zero or more tokens" branch of the macro (in order to support the optional format string), and passing the empty token tree into `format_args!` results in the confusing error. If instead we match a token tree of one or more tokens, we get a much more sensible "unexpected end of macro invocation" error. While we're here, fix up a stray space before a comma in the match guards. Resolves #39369. 2017-02-05 00:47:46 -06:00			`fn main() {`
			`assert_eq!(1, 1,);`
			`}`