Issue #17520 has been reported by dorianmariefr (Dorian Mari=E9).

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Bug #17520: Allow symbols starting with number, e.g. :2_weeks
https://bugs.ruby-lang.org/issues/17520

* Author: dorianmariefr (Dorian Mari=E9)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-darwin19]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------

For instance:

```
p({ 2_weeks: 1 })
```

results in:

```
a.rb:1: trailing `_' in number
p({ 2_weeks: 1 })
a.rb:1: syntax error, unexpected local variable or method, expecting =3D>
p({ 2_weeks: 1 })
```

and =


```
p({ :2_weeks =3D> 1 })
```

results in:

```
a.rb:1: trailing `_' in number
p({ :2_weeks =3D> 1 })
a.rb:1: syntax error, unexpected integer literal, expecting literal content=
 or terminator or tSTRING_DBEG or tSTRING_DVAR
```

I'm not sure if it's doable as ruby thinks I'm writing a number, just wonde=
ring if that could be possible to start a symbol with a number



-- =

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