dc: fix '?'

function                                             old     new   delta
zdc_parse_expr                                       470     479      +9
zxc_vm_process                                       839     814     -25
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 9/-25)             Total: -16 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/testsuite/dc.tests b/testsuite/dc.tests
index 29b413cad..87b1e71c3 100755
--- a/testsuite/dc.tests
+++ b/testsuite/dc.tests
@@ -41,6 +41,11 @@ testing "dc complex without spaces (multiple args)" \
         "16\n" \
         "" ""
 
+testing "dc read" \
+        "dc -finput" \
+        "2\n9\n1\n" \
+        "1?2\nf" "9\n"
+
 optional FEATURE_DC_BIG
 # All tests below depend on FEATURE_DC_BIG