tree cecc275b17e4057a564317d90e582c5cb25da87f
parent d9f33a479f8012f7495d197e4b7417cba4d477fa
author Ian Lance Taylor <iant@golang.org> 1517517898 -0800
committer Ian Lance Taylor <iant@golang.org> 1517795757 +0000

compiler: update iota handling, fix using iota in array length

CL 71750 changed the definition of how iota works.  This patch updates
gccgo for the new definition.

We've been mishandling iota appearing in a type that appears in a
const expression, as in `c = len([iota]int{})`.  Correct that by copying
type expressions when we copy an expression.  For simplicity only copy
when it can change the size of a type, as that is the only case where
iota in a type can affect the value of a constant (I think).  This is
still a bunch of changes, but almost all boilerplate.

Fixes golang/go#22341

Change-Id: I7c96215ec0c373434facf2564e2911314b9e36ad
Reviewed-on: https://go-review.googlesource.com/91475
Reviewed-by: Than McIntosh <thanm@google.com>