mike e01eb42e74
fix NotAConstant error help message (#8293)
```
Error: nu::parser::not_a_constant (link)

  × Not a constant.
   ╭─[entry #23:1:1]
 1 │ let file = "/home/user/file"; source $file
   ·                                      ──┬──
   ·                                        ╰── Value is not a parse-time constant
   ╰────
  help: Only a subset of expressions are allowed
        constants during parsing. Try using the 'let'
        command or typing the value literally.
```
this pr changes the help message to 'Try using the `const` command ...'
2023-03-02 19:07:25 -06:00
..
2022-12-22 13:41:44 +02:00
2023-02-27 20:44:05 +13:00
2023-02-27 20:44:05 +13:00