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Previously, a production rule like A: B C D would cause yacc to check that A and B have the same declared types, but then it would generate an implicit action of { $$ = $3 } (i.e., copy the value from D), even if A and D have different types. Fixes golang#10192. Change-Id: I51cfd7baa0011557141dca33b7af1d892cc6f49e Reviewed-on: https://go-review.googlesource.com/7780 Reviewed-by: Russ Cox <[email protected]>
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