docs(alloc::fmt): Make type optional, instead of matching empty string

Think this is clearer.

Noticed as I was implementing [`tree-sitter-rust-format-args`](https://github.com/nik-rev/tree-sitter-rust-format-args), and attempting to match the empty string results in an error.

Rollup of 12 pull requests

Successful merges:

 - #142300 (Disable `tests/run-make/mte-ffi` because no CI runners have MTE extensions enabled)
 - #143271 (Store the type of each GVN value)
 - #143280 (Remove duplicate error about raw underscore lifetime)
 - #143649 (Add test for `default_field_values` and `const_default`)
 - #143699 (Make `AsyncDrop` check that it's being implemented on a local ADT)
 - #143719 (Emit warning when there is no space between `-o` and arg)
 - #143833 (Ban projecting into SIMD types [MCP838])
 - #143891 (Port `#[coverage]` to the new attribute system)
 - #143908 (`tests/ui`: A New Order [0/28] )
 - #143909 (docs(alloc::fmt): Make type optional, instead of matching empty string)
 - #143925 (Make slice comparisons const)
 - #143997 (Use $crate in macros for rustc_public (aka stable_mir))

r? `@ghost`
`@rustbot` modify labels: rollup

docs(alloc::fmt): Make type optional, instead of matching empty string

Think this is clearer.

Noticed as I was implementing [`tree-sitter-rust-format-args`](https://github.com/nik-rev/tree-sitter-rust-format-args), and attempting to match the empty string results in an error.

Rollup of 12 pull requests

Successful merges:

 - #143280 (Remove duplicate error about raw underscore lifetime)
 - #143649 (Add test for `default_field_values` and `const_default`)
 - #143699 (Make `AsyncDrop` check that it's being implemented on a local ADT)
 - #143704 (Be a bit more careful around exotic cycles in in the inliner)
 - #143908 (`tests/ui`: A New Order [0/28] )
 - #143909 (docs(alloc::fmt): Make type optional, instead of matching empty string)
 - #143925 (Make slice comparisons const)
 - #143997 (Use $crate in macros for rustc_public (aka stable_mir))
 - #144013 (resolve: Make disambiguators for underscore bindings module-local)
 - #144029 (Fix wrong messages from methods with the same name from different traits)
 - #144063 (Add myself to the `infra-ci` reviewer group and adjust some infra auto-labels)
 - #144069 (ci: use windows 22 for all free runners)

r? `@ghost`
`@rustbot` modify labels: rollup

Rollup of 11 pull requests

Successful merges:

 - #143280 (Remove duplicate error about raw underscore lifetime)
 - #143649 (Add test for `default_field_values` and `const_default`)
 - #143699 (Make `AsyncDrop` check that it's being implemented on a local ADT)
 - #143908 (`tests/ui`: A New Order [0/28] )
 - #143909 (docs(alloc::fmt): Make type optional, instead of matching empty string)
 - #143925 (Make slice comparisons const)
 - #143997 (Use $crate in macros for rustc_public (aka stable_mir))
 - #144013 (resolve: Make disambiguators for underscore bindings module-local)
 - #144029 (Fix wrong messages from methods with the same name from different traits)
 - #144063 (Add myself to the `infra-ci` reviewer group and adjust some infra auto-labels)
 - #144069 (ci: use windows 22 for all free runners)

r? `@ghost`
`@rustbot` modify labels: rollup

Rollup merge of #143909 - nik-rev:patch-1, r=jhpratt

docs(alloc::fmt): Make type optional, instead of matching empty string

Think this is clearer.

Noticed as I was implementing [`tree-sitter-rust-format-args`](https://github.com/nik-rev/tree-sitter-rust-format-args), and attempting to match the empty string results in an error.

docs(alloc::fmt): Make type optional, instead of matching empty string

Think this is clearer.

Noticed as I was implementing [`tree-sitter-rust-format-args`](https://github.com/nik-rev/tree-sitter-rust-format-args), and attempting to match the empty string results in an error.

…iaskrgr

Rollup of 11 pull requests

Successful merges:

 - rust-lang#143280 (Remove duplicate error about raw underscore lifetime)
 - rust-lang#143649 (Add test for `default_field_values` and `const_default`)
 - rust-lang#143699 (Make `AsyncDrop` check that it's being implemented on a local ADT)
 - rust-lang#143908 (`tests/ui`: A New Order [0/28] )
 - rust-lang#143909 (docs(alloc::fmt): Make type optional, instead of matching empty string)
 - rust-lang#143925 (Make slice comparisons const)
 - rust-lang#143997 (Use $crate in macros for rustc_public (aka stable_mir))
 - rust-lang#144013 (resolve: Make disambiguators for underscore bindings module-local)
 - rust-lang#144029 (Fix wrong messages from methods with the same name from different traits)
 - rust-lang#144063 (Add myself to the `infra-ci` reviewer group and adjust some infra auto-labels)
 - rust-lang#144069 (ci: use windows 22 for all free runners)

r? `@ghost`
`@rustbot` modify labels: rollup

docs(alloc::fmt): Make type optional, instead of matching empty string

Think this is clearer.

Noticed as I was implementing [`tree-sitter-rust-format-args`](https://github.com/nik-rev/tree-sitter-rust-format-args), and attempting to match the empty string results in an error.

Rollup of 11 pull requests

Successful merges:

 - rust-lang/rust#143280 (Remove duplicate error about raw underscore lifetime)
 - rust-lang/rust#143649 (Add test for `default_field_values` and `const_default`)
 - rust-lang/rust#143699 (Make `AsyncDrop` check that it's being implemented on a local ADT)
 - rust-lang/rust#143908 (`tests/ui`: A New Order [0/28] )
 - rust-lang/rust#143909 (docs(alloc::fmt): Make type optional, instead of matching empty string)
 - rust-lang/rust#143925 (Make slice comparisons const)
 - rust-lang/rust#143997 (Use $crate in macros for rustc_public (aka stable_mir))
 - rust-lang/rust#144013 (resolve: Make disambiguators for underscore bindings module-local)
 - rust-lang/rust#144029 (Fix wrong messages from methods with the same name from different traits)
 - rust-lang/rust#144063 (Add myself to the `infra-ci` reviewer group and adjust some infra auto-labels)
 - rust-lang/rust#144069 (ci: use windows 22 for all free runners)

r? `@ghost`
`@rustbot` modify labels: rollup

Rollup of 11 pull requests

Successful merges:

 - rust-lang/rust#143280 (Remove duplicate error about raw underscore lifetime)
 - rust-lang/rust#143649 (Add test for `default_field_values` and `const_default`)
 - rust-lang/rust#143699 (Make `AsyncDrop` check that it's being implemented on a local ADT)
 - rust-lang/rust#143908 (`tests/ui`: A New Order [0/28] )
 - rust-lang/rust#143909 (docs(alloc::fmt): Make type optional, instead of matching empty string)
 - rust-lang/rust#143925 (Make slice comparisons const)
 - rust-lang/rust#143997 (Use $crate in macros for rustc_public (aka stable_mir))
 - rust-lang/rust#144013 (resolve: Make disambiguators for underscore bindings module-local)
 - rust-lang/rust#144029 (Fix wrong messages from methods with the same name from different traits)
 - rust-lang/rust#144063 (Add myself to the `infra-ci` reviewer group and adjust some infra auto-labels)
 - rust-lang/rust#144069 (ci: use windows 22 for all free runners)

r? `@ghost`
`@rustbot` modify labels: rollup