--- a/xpcom/idl-parser/header.py
+++ b/xpcom/idl-parser/header.py
@@ -346,17 +346,17 @@ def write_interface(iface, fd):
         printComments(fd, m.doccomments, '  ')
 
         fd.write("  /* %s */\n" % m.toIDL())
         fd.write("  %s = 0;\n\n" % methodAsNative(m))
 
     def write_attr_decl(a):
         printComments(fd, a.doccomments, '  ')
 
-        fd.write("  /* %s */\n" % a.toIDL());
+        fd.write("  /* %s */\n" % a.toIDL())
 
         fd.write("  %s = 0;\n" % attributeAsNative(a, True))
         if a.infallible:
             fd.write(attr_infallible_tmpl %
                      {'realtype': a.realtype.nativeType('in'),
                       'nativename': attributeNativeName(a, getter=True),
                       'args': '' if not a.implicit_jscontext else 'JSContext* cx',
                       'argnames': '' if not a.implicit_jscontext else 'cx, '})

--- a/xpcom/idl-parser/xpidl.py
+++ b/xpcom/idl-parser/xpidl.py
@@ -735,30 +735,30 @@ class Attribute(object):
                 self.binaryname = value
                 continue
 
             if name == 'Null':
                 if value is None:
                     raise IDLError("'Null' attribute requires a value", aloc)
                 if readonly:
                     raise IDLError("'Null' attribute only makes sense for setters",
-                                   aloc);
+                                   aloc)
                 if value not in ('Empty', 'Null', 'Stringify'):
                     raise IDLError("'Null' attribute value must be 'Empty', 'Null' or 'Stringify'",
-                                   aloc);
+                                   aloc)
                 self.null = value
             elif name == 'Undefined':
                 if value is None:
                     raise IDLError("'Undefined' attribute requires a value", aloc)
                 if readonly:
                     raise IDLError("'Undefined' attribute only makes sense for setters",
-                                   aloc);
+                                   aloc)
                 if value not in ('Empty', 'Null'):
                     raise IDLError("'Undefined' attribute value must be 'Empty' or 'Null'",
-                                   aloc);
+                                   aloc)
                 self.undefined = value
             else:
                 if value is not None:
                     raise IDLError("Unexpected attribute value", aloc)
 
                 if name == 'noscript':
                     self.noscript = True
                 elif name == 'implicit_jscontext':
@@ -944,24 +944,24 @@ class Param(object):
                 if value is None:
                     raise IDLError("'iid_is' must specify a parameter", aloc)
                 self.iid_is = value
             elif name == 'Null':
                 if value is None:
                     raise IDLError("'Null' must specify a parameter", aloc)
                 if value not in ('Empty', 'Null', 'Stringify'):
                     raise IDLError("'Null' parameter value must be 'Empty', 'Null', or 'Stringify'",
-                                   aloc);
+                                   aloc)
                 self.null = value
             elif name == 'Undefined':
                 if value is None:
                     raise IDLError("'Undefined' must specify a parameter", aloc)
                 if value not in ('Empty', 'Null'):
                     raise IDLError("'Undefined' parameter value must be 'Empty' or 'Null'",
-                                   aloc);
+                                   aloc)
                 self.undefined = value
             else:
                 if value is not None:
                     raise IDLError("Unexpected value for attribute '%s'" % name,
                                    aloc)
 
                 if name == 'const':
                     self.const = True