[3.8] [BUG] TLA top-level await breaks with parenthesis #36817

This is a consequence of how we parse source files and determine whether they are a Module or a Script based on the presence or absence of import or export declarations. According to the TLA proposal, await is now treated like a keyword at the top level of a Module, but not a Script. The fact that await p (without parens) works at the top level currently is actually due to the fact we would parse it as an AwaitExpression for error reporting purposes (and still do for await in a normal function).

To address this, we will likely need to "reparse" a function call whose expression is an await and replace it with an AwaitExpression in any top-level position.

We are discussing the details necessary to make this work, but it may depend on changes to our AST Node Factory API proposed in #35282