Extract functions for two closures

These closures were quite complex and part of a quite complex function.
The fact that they are closures makes mistakes likely when refactoring.
For example, earlier, I meant to use `resolved`, an argument of the
closure, but I instead typed `res`, which captured a local variable and
caused a subtle bug that led to a confusing test failure.

Extracting them as functions makes the code easier to understand and
refactor.

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