error: expected identifier, found reserved identifier `_` --> $DIR/issue-91461.rs:2:7 | LL | a(_:b:,) | ^ expected identifier, found reserved identifier error: expected type, found `,` --> $DIR/issue-91461.rs:2:11 | LL | a(_:b:,) | - -^ expected type | | | | | tried to parse a type due to this type ascription | while parsing this struct | = note: `#![feature(type_ascription)]` lets you annotate an expression with a type: `<expr>: <type>` = note: see issue #23416 <https://github.com/rust-lang/rust/issues/23416> for more information error: expected type, found `,` --> $DIR/issue-91461.rs:2:11 | LL | a(_:b:,) | -^ expected type | | | tried to parse a type due to this type ascription | = note: `#![feature(type_ascription)]` lets you annotate an expression with a type: `<expr>: <type>` = note: see issue #23416 <https://github.com/rust-lang/rust/issues/23416> for more information error: aborting due to 3 previous errors