Incorrect multiline enum parsing

[fedeci]

Bug Report

🔎 Search Terms

• multiline enum
• line break enum
• enum parsing

🕗 Version & Regression Information

I don't think this is a regression.

⏯ Playground Link

Playground link with relevant code

💻 Code

enum
E 
{
  foo,
  bar
}

enum
F {
  foo,
  bar
}

🙁 Actual behavior

These declarations are parsed as valid enum declarations.

🙂 Expected behavior

enum declarations containing a line break between the enum keyword and the identifier should be parsed as multiple expressions.

- EnumDeclaration
+ ExpressionStatement: Identifier: enum
+ ExpressionStatement: Identifier: E
+ Block

Linked issues

babel/babel#12773, babel/babel#12776
Also consider: babel/babel#12776 (comment)
/cc @armano2 @JLHwung @nicolo-ribaudo

[nicolo-ribaudo]

Note that I don't think that this is a bug: enum is a reserved word (and not a valid identifier), so there is no ambiguity allowing a line terminator.

(this issue was probably opened in response to babel/babel#12776 (comment)).

[DanielRosenwasser]

Correct, this is working as intended.