3bbbf39b58
This patch adds support for recovering well-formed (and near-complete) ASTs for semantically malformed keyed reads and keyed writes. See the added tests for details on the types of semantics we can now recover; in particular, notice that some assumptions are made about the form of a keyed read/write intended by a user. For example, in the malformed expression `a[1 + = 2`, we assume that the user meant to write a binary expression for the key of `a`, and assign that key the value `2`. In particular, we now parse this as `a[1 + <empty expression>] = 2`. There are some different interpretations that can be made here, but I think this is reasonable. The actual changes in the parser code are fairly minimal (a nice surprise!); the biggest addition is a `writeContext` that marks whether the `=` operator can serve as a recovery point after error detection. Part of #38596 PR Close #39004
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