go/types, types2: refactor assignVars Rather than using exprList and handle all cases together, split apart the cases of n:n assignments and the cases of n:1 assignments. For the former, the lhs types may (in a future CL) be used to infer types on the rhs. This is a preparatory step. Because the two cases are handled separately, the code is longer (but also more explicit). Some test cases were adjusted to avoifd (legitimate, but previously supressed) "declared but not used" errors. Change-Id: Ia43265f84e423b0ad5594612ba5a0ddce31a4a37 Reviewed-on: https://go-review.googlesource.com/c/go/+/478256 Reviewed-by: Robert Griesemer <gri@google.com> Reviewed-by: Robert Findley <rfindley@google.com> Run-TryBot: Robert Griesemer <gri@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Auto-Submit: Robert Griesemer <gri@google.com>
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