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cmd/compile/internal/syntax: always construct a correct syntax tree

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- parser creates sensible nodes in case of syntax errors instead of nil
- a new BadExpr node is used in places where we can't do better
- fixed error message for incorrect type switch guard
- minor cleanups

Fixes #19663.

Change-Id: I028394c6db9cba7371f0e417ebf93f594659786a
Reviewed-on: https://go-review.googlesource.com/38653
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This commit is contained in:
Robert Griesemer 2017-03-24 16:23:21 -07:00
parent ecc6a81617
commit d1f5e5f482
6 changed files with 132 additions and 85 deletions
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1
src/cmd/compile/fmt_test.go
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@ -646,7 +646,6 @@ var knownFormats = map[string]string{
"cmd/compile/internal/ssa.regMask %d": "",
"cmd/compile/internal/ssa.register %d": "",
"cmd/compile/internal/syntax.Expr %#v": "",
"cmd/compile/internal/syntax.Expr %s": "",
"cmd/compile/internal/syntax.Node %T": "",
"cmd/compile/internal/syntax.Operator %d": "",
"cmd/compile/internal/syntax.Operator %s": "",