Minor bugfixes (including #48 and #51).

execution.py

@@ -1251,7 +1251,7 @@ def FROMBASE(self, number, base=None):
             if len(number) == 0:
                 number = 0
             try:
-                result = int(str(number), base)
+                result = int(str(number).replace("_", " "), base)
                 return Scalar(result)
             except ValueError:
                 # TBD: make more robust? Or just let it stay nil

pip.py

@@ -142,7 +142,7 @@ def pip(code=None, argv=None, interactive=True):
                   "n" if options.newline else
                   "l" if options.lines else
                   None)
-    if not (code or options.execute or options.file or options.stdin):
+    if code is None and not (options.execute or options.file or options.stdin):
         if interactive:
             options.stdin = True
             print("Enter your program, terminated by Ctrl-D or Ctrl-Z:")
@@ -152,7 +152,7 @@ def pip(code=None, argv=None, interactive=True):
         else:
             print(f"Type {sys.argv[0]} -h for usage information.")
             sys.exit(0)
-    if code:
+    if code is not None:
         # Code is passed into function
         program = code
     elif options.execute:

scanning.py

@@ -82,6 +82,9 @@ def tokenize(code):
             # Discard block comments
             #!print("Block comment:", repr(m.group()))
             code = code[m.end():]
+        elif code[:2] == "{;":
+            err.die("Unterminated block comment:", code.strip(),
+                    errorClass=IncompleteSyntax)
         elif m := whitespaceRgx.match(code):
             # Discard leading whitespace
             #!print("Whitespace:", repr(m.group()))