testing/quick: skip struct fields that cannot be set by Value function

[minond]

Fixes #27017

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Patch Set 1:

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Message from Gerrit User 5065:

Patch Set 1:

(1 comment)

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Message from Gerrit User 5206:

Patch Set 1:

Per discussion on the issue, I don't think this is a good idea.

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This PR is being closed because golang.org/cl/129536 has been abandoned.

Abandoned and acknowledged by author in #27017 (comment)