LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/68820043

In file included from src/lib9/utf/utfecpy.c:17:0:
src/lib9/utf/utfdef.h:28:0: error: "nil" redefined [-Werror]
In file included from src/lib9/utf/utfrrune.c:17:0:
src/lib9/utf/utfdef.h:28:0: error: "nil" redefined [-Werror]

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/63410043

warning: src/lib9/fmt/dorfmt.c:64 unreachable code RETURN
warning: src/lib9/fmt/fltfmt.c:184 set and not used: p
warning: src/lib9/utf/utflen.c:35 unreachable code RETURN
warning: src/lib9/utf/utfrrune.c:45 unreachable code RETURN
warning: src/lib9/utf/utfrune.c:44 unreachable code RETURN

LGTM=rsc
R=rsc, iant, gobot
CC=golang-codereviews
https://golang.org/cl/57170052

Built after adding -Wconversion to the list of compiler
arguments used when building.  I believe these are all OK
assuming we will not change the API.  There is no effort to
detect overflow due to very long strings.

R=golang-dev, dave, rsc, r
CC=golang-dev
https://golang.org/cl/10195044

R=golang-dev, r, bradfitz
CC=golang-dev
https://golang.org/cl/8651043

<stdint.h> does not seem to be needed.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/8178044

R=minux.ma, rsc, akumar, bradfitz
CC=golang-dev
https://golang.org/cl/7313070

Fixes #2874.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6820068

This is required by the spec to produce the replacement char.
The fix lies in lib9's rune code.

R=golang-dev, nigeltao, rsc
CC=golang-dev
https://golang.org/cl/6443109

There are a few more but these are the easiest ones.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5756067