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Remove unused traitlist from Type struct

--- a/parse/parse.h

+++ b/parse/parse.h

@@ -113,8 +113,6 @@

 	Vis vis;

 	Bitset *traits;	/* the type constraints matched on this type */

-	Node **traitlist;  /* The names of the constraints on the type. Used to fill the bitset */

-	size_t ntraitlist; /* The length of the constraint list above */

 	Type **gparam;  /* Tygeneric: type parameters that match the type args */

 	size_t ngparam; /* Tygeneric: count of type parameters */

--- a/parse/type.c

+++ b/parse/type.c

@@ -100,8 +100,6 @@

 	r->fixed = 0;		/* re-resolving doesn't hurt */

 	r->traits = bsdup(t->traits);

-	r->traitlist = memdup(t->traitlist, t->ntraitlist * sizeof(Node *));

-	r->ntraitlist = t->ntraitlist;

 	r->arg = memdup(t->arg, t->narg * sizeof(Type *));

 	r->narg = t->narg;