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a417518173
Now that `..=` inclusive ranges are stabilized, people probably shouldn't be using `...` even in patterns, even if it's still legal there (see #51043). To avoid drawing attention to `...` being a real thing, let's reword this message to just say "unexpected token" rather "cannot be used in expressions".
The syntax crate contains those things concerned purely with syntax
– that is, the AST ("abstract syntax tree"), parser, pretty-printer,
lexer, macro expander, and utilities for traversing ASTs.
For more information about how these things work in rustc, see the rustc guide: