core: don't error on computed value during input walk

[phinze]

fixes #2987

[josephholsten]

@phinze are you waiting to merge this for something? my amateur eye thinks the described behaviour makes sense (if the test context is a bit beyond me).

[phinze]

Thanks for the ping, @josephholsten - your +1 and my one-month later review I think are sufficient. 😉

[ghost]

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