Lexer is too permissive with numbers followed by an identifier (e.g. "1foo")
Summary
GHC's lexer lexes numbers followed by an identifier as two separate tokens (number and then identifier) when I think it should reject this as invalid.
Steps to reproduce
GHCi, version 9.8.1: https://www.haskell.org/ghc/ :? for help
ghci> foo = 1
ghci> (+) 1foo
2
Expected behavior
I would expect the lexer to throw an error.
Environment
- GHC version used: 9.8.1
Optional:
- Operating System:
- System Architecture: