b67c2f1572
Refactor `ExprConcatStrings::eval` by inlining two only-called-once closures into the call-site, so that the code is easier to reason about locally (especially since the variables that were closed over were mutated all over the place within this function). Also use curly braces with each branch for consistency in the the resulting code. This is a pure refactor, but also arguably causes us to depend less on the optimizer; now, we don't have to make sure that this closure is inlined.
Nix
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