Ensure that files are parsed/evaluated only once (2nd attempt) #14040
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Motivation
Fixes the segfault in #13938 that necessitated the revert in #14013.
ExprParseFileis allocated on the heap for now. We can put it back on the stack once if #13930 is merged (since it ensures the postcondition that the expr is unreachable afterforceValue()returns).Context
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