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Matthew Dempsky f22ef70254 cmd/compile: allow := to shadow dot-imported names
Historically, gc optimistically parsed the left-hand side of
assignments as expressions. Later, if it discovered a ":=" assignment,
it rewrote the parsed expressions as declarations.

This failed in the presence of dot imports though, because we lost
information about whether an imported object was named via a bare
identifier "Foo" or a normal qualified "pkg.Foo".

This CL fixes the issue by specially noding the left-hand side of ":="
assignments.

Fixes #22076.

Change-Id: I18190ecdb863112e7d009e1687e6112eec559921
Reviewed-on: https://go-review.googlesource.com/66810
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2017-10-05 18:07:37 +00:00
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src cmd/compile: allow := to shadow dot-imported names 2017-10-05 18:07:37 +00:00
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