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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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2
src/cmd/compile/internal/syntax/syntax.go
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@ -65,7 +65,7 @@ func Parse(base *src.PosBase, src io.Reader, errh ErrorHandler, pragh PragmaHand
var p parser
p.init(base, src, errh, pragh)
p.next()
return p.file(), p.first
return p.fileOrNil(), p.first
}
// ParseBytes behaves like Parse but it reads the source from the []byte slice provided.