Fixed error in handling of 'dot' label

pyasm/pyasm

@@ -627,10 +627,12 @@ def eval_expr(expr):
     if expr is None:
         return None
 
+    print('eval_expr: initial expr=%s' % expr)
+
     # replace any "." value with "dot" defined in the symbol table
-    expr = string.replace(expr, '.', 'DOT')
+    expr = string.replace(expr, '.', '_D_O_T_')
     globs = copy.deepcopy(SymTable)
-    globs['DOT'] = Dot       # add in the "." address
+    globs['_D_O_T_'] = Dot       # add in the "." address
 
     # evaluate the expression
     try:

pyasm/test.asm

@@ -1,6 +1,11 @@
 ; a very simple 'smoke-test' file
-        org     0100
+        org     02
 
-start   hlt
+dot     equ     01
+
+        org     0200
+
+start   jmp     dot
+        hlt
 
         end     start