rust/tests/ui/fmt/format-args-capture-issue-106408.rs

// check-pass
// aux-build:format-string-proc-macro.rs

extern crate format_string_proc_macro;

fn main() {
    // While literal macros like `format_args!(concat!())` are not supposed to work with implicit
    // captures, it should work if the whole invocation comes from a macro expansion (#106408).
    format_string_proc_macro::format_args_captures!();
}
Properly allow macro expanded `format_args` invocations to uses captures Originally, this was kinda half-allowed. There were some primitive checks in place that looked at the span to see whether the input was likely a literal. These "source literal" checks are needed because the spans created during `format_args` parsing only make sense when it is indeed a literal that was written in the source code directly. This is orthogonal to the restriction that the first argument must be a "direct literal", not being exanpanded from macros. This restriction was imposed by [RFC 2795] on the basis of being too confusing. But this was only concerned with the argument of the invocation being a literal, not whether it was a source literal (maybe in spirit it meant it being a source literal, this is not clear to me). Since the original check only really cared about source literals (which is good enough to deny the `format_args!(concat!())` example), macros expanding to `format_args` invocations were able to use implicit captures if they spanned the string in a way that lead back to a source string. The "source literal" checks were not strict enough and caused ICEs in certain cases (see # 106191 (the space is intended to avoid spammy backreferences)). So I tightened it up in # 106195 to really only work if it's a direct source literal. This caused the `indoc` crate to break. `indoc` transformed the source literal by removing whitespace, which made it not a "source literal" anymore (which is required to fix the ICE). But since `indoc` spanned the literal in ways that made the old check think that it's a literal, it was able to use implicit captures (which is useful and nice for the users of `indoc`). This commit properly seperates the previously introduced concepts of "source literal" and "direct literal" and therefore allows `indoc` invocations, which don't create "source literals" to use implicit captures again. [RFC 2795]: https://rust-lang.github.io/rfcs/2795-format-args-implicit-identifiers.html#macro-hygiene 2023-01-05 13:17:30 -06:00			`// check-pass`
			`// aux-build:format-string-proc-macro.rs`

			`extern crate format_string_proc_macro;`

			`fn main() {`
			// While literal macros like `format_args!(concat!())` are not supposed to work with implicit
			`// captures, it should work if the whole invocation comes from a macro expansion (#106408).`
			`format_string_proc_macro::format_args_captures!();`
			`}`