mike a3bf2bff49
improve error when name and parameters are not space-separated (#8958)
# Description
closes #8934

this pr improves the diagnostic emitted when the name and parameters of
either `def`, `def-env` or `extern` are not separated by a space

```nu
Error:
  × no space between name and parameters
   ╭─[entry #1:1:1]
 1 │ def err[] {}
   ·        ▲
   ·        ╰── expected space
   ╰────
  help: consider adding a space between the `def` command's name and its parameters
```

from

```nu
Error: nu::parser::missing_positional

  × Missing required positional argument.
   ╭─[entry #1:1:1]
 1 │ def err[] {}
   ╰────
  help: Usage: def <def_name> <params> <body>
```

---------

Co-authored-by: Darren Schroeder <343840+fdncred@users.noreply.github.com>
Co-authored-by: Jelle Besseling <jelle@pingiun.com>
2023-05-12 09:10:40 -05:00
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