bpo-32150: Expand tabs to spaces in C files. (#4583)

diff --git a/Parser/parser.h b/Parser/parser.h
index 403236d..39df948 100644
--- a/Parser/parser.h
+++ b/Parser/parser.h
@@ -10,23 +10,23 @@
 #define MAXSTACK 1500
 
 typedef struct {
-	int		 s_state;	/* State in current DFA */
-	dfa		*s_dfa;		/* Current DFA */
-	struct _node	*s_parent;	/* Where to add next node */
+    int              s_state;       /* State in current DFA */
+    dfa             *s_dfa;         /* Current DFA */
+    struct _node    *s_parent;      /* Where to add next node */
 } stackentry;
 
 typedef struct {
-	stackentry	*s_top;		/* Top entry */
-	stackentry	 s_base[MAXSTACK];/* Array of stack entries */
-					/* NB The stack grows down */
+    stackentry      *s_top;         /* Top entry */
+    stackentry       s_base[MAXSTACK];/* Array of stack entries */
+                                    /* NB The stack grows down */
 } stack;
 
 typedef struct {
-	stack	 	p_stack;	/* Stack of parser states */
-	grammar		*p_grammar;	/* Grammar to use */
-	node		*p_tree;	/* Top of parse tree */
+    stack           p_stack;        /* Stack of parser states */
+    grammar         *p_grammar;     /* Grammar to use */
+    node            *p_tree;        /* Top of parse tree */
 #ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
-	unsigned long	p_flags;	/* see co_flags in Include/code.h */
+    unsigned long   p_flags;        /* see co_flags in Include/code.h */
 #endif
 } parser_state;