rust/tests/ui/async-await/issues/issue-60674.stdout

async fn f(mut x: u8) {}
async fn g((mut x, y, mut z): (u8, u8, u8)) {}
async fn g(mut x: u8, (a, mut b, c): (u8, u8, u8), y: u8) {}
Improve `print_tts` by changing `tokenstream::Spacing`. `tokenstream::Spacing` appears on all `TokenTree::Token` instances, both punct and non-punct. Its current usage: - `Joint` means "can join with the next token and that token is a punct". - `Alone` means "cannot join with the next token or can join with the next token but that token is not a punct". The fact that `Alone` is used for two different cases is awkward. This commit augments `tokenstream::Spacing` with a new variant `JointHidden`, resulting in: - `Joint` means "can join with the next token and that token is a punct". - `JointHidden` means "can join with the next token and that token is a not a punct". - `Alone` means "cannot join with the next token". This drastically improves the output of `print_tts`. For example, this: ``` stringify!(let a: Vec<u32> = vec![];) ``` currently produces this string: ``` let a : Vec < u32 > = vec! [] ; ``` With this PR, it now produces this string: ``` let a: Vec<u32> = vec![] ; ``` (The space after the `]` is because `TokenTree::Delimited` currently doesn't have spacing information. The subsequent commit fixes this.) The new `print_tts` doesn't replicate original code perfectly. E.g. multiple space characters will be condensed into a single space character. But it's much improved. `print_tts` still produces the old, uglier output for code produced by proc macros. Because we have to translate the generated code from `proc_macro::Spacing` to the more expressive `token::Spacing`, which results in too much `proc_macro::Along` usage and no `proc_macro::JointHidden` usage. So `space_between` still exists and is used by `print_tts` in conjunction with the `Spacing` field. This change will also help with the removal of `Token::Interpolated`. Currently interpolated tokens are pretty-printed nicely via AST pretty printing. `Token::Interpolated` removal will mean they get printed with `print_tts`. Without this change, that would result in much uglier output for code produced by decl macro expansions. With this change, AST pretty printing and `print_tts` produce similar results. The commit also tweaks the comments on `proc_macro::Spacing`. In particular, it refers to "compound tokens" rather than "multi-char operators" because lifetimes aren't operators. 2023-08-07 20:43:44 -05:00			`async fn f(mut x: u8) {}`
Add spacing information to delimiters. This is an extension of the previous commit. It means the output of something like this: ``` stringify!(let a: Vec<u32> = vec![];) ``` goes from this: ``` let a: Vec<u32> = vec![] ; ``` With this PR, it now produces this string: ``` let a: Vec<u32> = vec![]; ``` 2023-10-11 23:36:14 -05:00			`async fn g((mut x, y, mut z): (u8, u8, u8)) {}`
			`async fn g(mut x: u8, (a, mut b, c): (u8, u8, u8), y: u8) {}`