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Fixed bug in compound function

Once that parser arrive to the function compound MUST be a '{' and not CAN
be a one. So we have to change accept call to expect call.

--- a/flow.c

+++ b/flow.c

@@ -122,12 +122,11 @@

 void

 compound(void)

 {

-	if (accept('{')) {

-		new_ctx();

-		while (decl())

-			/* nothing */;

-		while (!accept('}'))

-			stmt();

-		del_ctx();

-	}

+	expect('{');

+	new_ctx();

+	while (decl())

+		/* nothing */;

+	while (!accept('}'))

+		stmt();

+	del_ctx();

 }

-- 

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