remove useless requires

racket/collects/syntax/parse/private/opt.rkt

@@ -1,15 +1,9 @@
 #lang racket/base
-(require syntax/stx
+(require racket/syntax
-         syntax/private/id-table
-         syntax/keyword
-         racket/syntax
          racket/pretty
          syntax/parse/private/residual-ct ;; keep abs. path
          "minimatch.rkt"
-         "rep-attrs.rkt"
-         "rep-data.rkt"
          "rep-patterns.rkt"
-         "rep.rkt"
          "kws.rkt")
 (provide (struct-out pk1)
          (rename-out [optimize-matrix0 optimize-matrix]))

racket/collects/syntax/parse/private/rep-data.rkt

@@ -1,15 +1,12 @@
 #lang racket/base
 (require racket/contract/base
          racket/dict
-         racket/list
          syntax/private/id-table
          racket/syntax
          syntax/parse/private/residual-ct ;; keep abs. path
          "make.rkt"
          "minimatch.rkt"
-         "kws.rkt"
+         "kws.rkt")
-         "rep-attrs.rkt"
-         "rep-patterns.rkt")
 ;; from residual.rkt
 (provide (struct-out stxclass)
          (struct-out options)

racket/collects/syntax/parse/private/rep-patterns.rkt

@@ -1,7 +1,6 @@
 #lang racket/base
 (require syntax/parse/private/residual-ct ;; keep abs. path
          "rep-attrs.rkt"
-         "kws.rkt"
          "minimatch.rkt"
          racket/syntax)
 (provide (all-defined-out))

racket/collects/syntax/parse/private/rep.rkt

@@ -1,6 +1,5 @@
 #lang racket/base
 (require (for-template racket/base
-                       racket/stxparam
                        syntax/parse/private/keywords
                        syntax/parse/private/residual ;; keep abs. path
                        syntax/parse/private/runtime)

racket/collects/syntax/parse/private/runtime.rkt

@@ -7,7 +7,6 @@
                      syntax/strip-context
                      racket/private/sc
                      racket/syntax
-                     "rep-attrs.rkt"
                      "rep-data.rkt"))
 
 (provide with