Stop allow_guessing for command line option parser

test/cmdlineTests.sh

@@ -83,6 +83,21 @@ function compileWithoutWarning()
     test -z "$output" -a "$failed" -eq 0
 }
 
+printTask "Testing unknown options..."
+(
+    set +e
+    output=$("$SOLC" --allow=test 2>&1)
+    failed=$?
+    set -e
+
+    if [ "$output" == "unrecognised option '--allow=test'" ] && [ $failed -ne 0 ] ; then
+	echo "Passed"
+    else
+	printError "Incorrect response to unknown options: $STDERR"
+	exit 1
+    fi
+)
+
 printTask "Compiling various other contracts and libraries..."
 (
 cd "$REPO_ROOT"/test/compilationTests/