structs, enums, and fused

Cython/Parser/Grammar

@@ -150,6 +150,12 @@ address: '&' factor
 cast: '<' type ['?'] '>' factor
 size_of: 'sizeof' '(' (type) ')'
 
-cdef_stmt: ('cdef' | 'cpdef') (classdef | cdef_decl)
-ctypedef_stmt: 'ctypedef' cdef_decl
+cdef_stmt: ('cdef' | 'cpdef') (classdef | cdef_decl | struct | enum | fused)
+ctypedef_stmt: 'ctypedef' (cdef_decl | struct | enum)
 cdef_decl: type NAME NEWLINE
+
+struct: ('struct' | 'union') NAME (NEWLINE | (':' struct_suite))
+struct_suite: NEWLINE INDENT (cdef_decl* | pass_stmt NEWLINE)+ DEDENT
+enum: 'enum' [NAME] (NEWLINE | ':' enum_suite)
+enum_suite: NEWLINE INDENT (NAME ['=' NUMBER] NEWLINE | pass_stmt NEWLINE)+ DEDENT
+fused: 'fused' NAME ':' NEWLINE INDENT ( type NEWLINE)+ DEDENT