Add a stub for set +C because yash's configure script uses it.

For now, I didn't implement set -C.

benchmarks/runtime.sh

@@ -69,10 +69,6 @@ configure-twice() {
  configure-and-copy $dir $OSH $TAR_DIR/${label}__osh
}


# TODO: Run under bash and osh.  Look for all the files that changed?  Using
# 'find'?  And then diff them.

yash() {
  configure-twice $TAR_DIR/yash-2.46
}
@@ -89,7 +85,7 @@ uftrace() {
  #configure-and-show-new $TAR_DIR/uftrace-0.8.1
}

# Flags are different.
# Works for bash/dash/osh!
ocaml() {
  configure-twice $TAR_DIR/ocaml-4.06.0
  #mkdir -p _tmp/ocaml
@@ -98,7 +94,9 @@ ocaml() {

# Same problem as tcc
qemu-old() {
  configure-and-show-new ~/src/qemu-1.6.0
  local out_dir=$PWD/_tmp/qemu-old
  mkdir -p $out_dir
  configure-and-copy ~/src/qemu-1.6.0 $OSH $out_dir
}

"$@"

core/state.py

@@ -70,6 +70,7 @@ def Set(self, b):
    ('u', 'nounset'),
    ('x', 'xtrace'),
    ('f', 'noglob'),
    ('C', 'noclobber'),
    (None, 'pipefail'),

    (None, 'debug-completion'),
@@ -88,6 +89,7 @@ def __init__(self):
    self.xtrace = False  # NOTE: uses PS4
    self.noglob = False  # -f
    self.noexec = False  # -n
    self.noclobber = False  # -C
    self.debug_completion = False

    # shopt -s / -u

spec/sh-options.test.sh

@@ -185,3 +185,24 @@ shopt -p nullglob
# stdout-json: "shopt -u nullglob\nshopt -s nullglob\n"
# N-I dash/mksh stdout-json: ""
# N-I dash/mksh status: 127

### noclobber off
set -o errexit
echo foo > $TMP/can-clobber
set +C
echo foo > $TMP/can-clobber
set +o noclobber
echo foo > $TMP/can-clobber
cat $TMP/can-clobber
# stdout: foo

### noclobber on
# Not implemented yet.
rm $TMP/no-clobber
set -C
echo foo > $TMP/no-clobber
echo $?
echo foo > $TMP/no-clobber
echo $?
# stdout-json: "0\n1\n"
# OK dash stdout-json: "0\n2\n"

test/spec.sh

@@ -406,7 +406,7 @@ var-sub-quote() {
}

sh-options() {
  sh-spec spec/sh-options.test.sh --osh-failures-allowed 2 \
  sh-spec spec/sh-options.test.sh --osh-failures-allowed 3 \
    ${REF_SHELLS[@]} $OSH "$@"
}