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Daniel Martí f14f7b3141 cmd/compile: make bad Ctypes be only 0 
Before, -1 meant a node being nil or not an OLITERAL, and 0 meant an
OLITERAL missing a Val.

However, the use of this value was confusing and led to some issues,
such as swt.go checking for < 0 instead of <= 0, causing panics.

We never need to differentiate these two cases, so collapse both into 0.
To make it clear that negative values can no longer happen, make Ctype
an uint8.

With this change, we can now get rid of the two n.Type == nil checks
in swt.go added to fix a couple of these panics.

Thanks to Matthew Dempsky for spotting this inconsistency.

Fixes #22001.

Change-Id: I51c65a76f38a3e16788b6a3b57932dad3436dc7e
Reviewed-on: https://go-review.googlesource.com/69510
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2017-10-10 17:06:53 +00:00
.github .github: update ISSUE_TEMPLATE to be closer to 'go bug' 2017-08-19 04:06:10 +00:00
api math/big: provide support for conversion bases up to 62 2017-10-06 17:46:15 +00:00
doc doc: add missing "Minor revisions" header for 1.9 2017-10-04 20:22:15 +00:00
lib/time time: vendor tzdata-2017b and update test 2017-06-07 21:23:58 +00:00
misc misc/cgo/testcarchive: skip flaky SIGPROF test on darwin 2017-10-09 06:02:50 +00:00
src cmd/compile: make bad Ctypes be only 0 2017-10-10 17:06:53 +00:00
test cmd/compile: better error message for assignment mismatches 2017-10-06 16:35:44 +00:00
.gitattributes .gitattributes: prevent all magic line ending changes 2014-12-12 23:14:54 +00:00
.gitignore .gitignore: include only Go project artifiacts 2017-08-15 21:37:05 +00:00
AUTHORS A+C: final updates for Go 1.9 2017-07-18 01:47:54 +00:00
CONTRIBUTING.md .github: recommend 'go bug' when filing an issue 2017-07-24 17:18:34 +00:00
CONTRIBUTORS A+C: final updates for Go 1.9 2017-07-18 01:47:54 +00:00
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +00:00
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
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README.md readme: add attribution for the Gopher image 2017-02-03 19:39:41 +00:00
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README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

Gopher image Gopher image by Renee French, licensed under Creative Commons 3.0 Attributions license.

Our canonical Git repository is located at https://go.googlesource.com/go. There is a mirror of the repository at https://github.com/golang/go.

Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.

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After downloading a binary release, visit https://golang.org/doc/install or load doc/install.html in your web browser for installation instructions.

Install From Source

If a binary distribution is not available for your combination of operating system and architecture, visit https://golang.org/doc/install/source or load doc/install-source.html in your web browser for source installation instructions.

Contributing

Go is the work of hundreds of contributors. We appreciate your help!

To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html

Note that the Go project does not use GitHub pull requests, and that we use the issue tracker for bug reports and proposals only. See https://golang.org/wiki/Questions for a list of places to ask questions about the Go language.