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Use quotes to improve error messages #1328

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@kud1ing

Since Haskell's [1 .. 10] is not (yet) implemented in Rust and i read about ranges, i tried

let a = [1 to 10];

this gives the baffling error message

error: expecting ,, found to

A more readable version would be

error: expecting "," but found "to"

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    A-frontendArea: Compiler frontend (errors, parsing and HIR)E-easyCall for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue.

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