ash: remove arithmetic expansion collapsing at parse time

Collapsing arithmetic expansion is incorrect when the inner arithmetic
expansion is a part of a parameter expansion.

Test case:
   unset a
   echo $((3 + ${a:=$((4 + 5))}))
   echo $a
Old result:
   12
   (4 + 5)
New result:
   12
   9

Based on commit bb777a6 from git://git.kernel.org/pub/scm/utils/dash/dash.git
by Herbert Xu

function                                             old     new   delta
readtoken1                                          3180    3163     -17

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

2 files changed, 5 insertions, 0 deletions

diff --git a/shell/ash_test/ash-vars/var-do-not-collapse-arithmetic-expansion-at-parse-time.right b/shell/ash_test/ash-vars/var-do-not-collapse-arithmetic-expansion-at-parse-time.right
new file mode 100644
index 000000000..81a15855c
--- /dev/null
+++ b/shell/ash_test/ash-vars/var-do-not-collapse-arithmetic-expansion-at-parse-time.right
@@ -0,0 +1,2 @@
+12
+9
diff --git a/shell/ash_test/ash-vars/var-do-not-collapse-arithmetic-expansion-at-parse-time.tests b/shell/ash_test/ash-vars/var-do-not-collapse-arithmetic-expansion-at-parse-time.tests
new file mode 100755
index 000000000..e97a08a57
--- /dev/null
+++ b/shell/ash_test/ash-vars/var-do-not-collapse-arithmetic-expansion-at-parse-time.tests
@@ -0,0 +1,3 @@
+unset a
+echo $((3 + ${a:=$((4 + 5))}))
+echo $a