[move] Fix issue where varcalls could persist into typing without an error.

[cgswords]

Description

This fixes a bug in how var calls were being resolved across naming into typing, when the variable was not a valid macro call target.

This also adds a lambda feature gate to make error reporting a bit nicer in these cases.

Test plan

New tests cover the crash/bug and ensure it doesn't occur now.

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Release notes

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• [ ] Protocol:
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