This fixes several issues:
1. Leading/trailing line comments surrounding a lambda should make that
lambda not "trailing", because the formatting otherwise looks bad and
also isn't stable
2. Fix incorrect algorithm for detecting trailing lambda (currently,
any number of lambdas makes the alg return `true`)
Fixes an issue where sentinel value (U+7FFF) occurring literally in the source could cause a premature termination of parsing, leading to potential EOF injection attacks.
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Co-authored-by: Dan Chao <dan.chao@apple.com>
This forces iterpolated expressions to be single-line, so that newline
literals within the bounds of two string delimiters can be seen as
verbatime newlines in the resulting string.
Edge case: in the case of a line comment, it's not possible to keep
this as a single line expression.
These are kept as multi-line expressions.
Also:
* Remove `ForceWrap`, this node is not used.
* Rename `StringConstant` -> `StringChars`
