removed useless requires

original commit: c7f86d276c68b12e87dc46cef4a8e1b95538f88d

collects/macro-debugger/analysis/check-requires.rkt

@@ -3,7 +3,6 @@
          racket/cmdline
          racket/match
          syntax/modcollapse
-         unstable/struct
          "private/get-references.rkt"
          "private/nom-use-alg.rkt"
          "private/util.rkt")

collects/macro-debugger/analysis/private/moduledb.rkt

@@ -1,7 +1,6 @@
 #lang racket/base
 (require syntax/modresolve
          setup/path-to-relative
-         "util.rkt"
          racket/match)
 (provide allow-bypass?
          allow-drop?

collects/macro-debugger/expand.rkt

@@ -1,5 +1,5 @@
 #lang racket/base
-(require racket/contract
+(require racket/contract/base
          "model/trace.rkt"
          "model/reductions-config.rkt"
          "model/reductions.rkt")

collects/macro-debugger/model/reductions-config.rkt

@@ -1,6 +1,6 @@
 #lang racket/base
 (require (for-syntax racket/base)
-         racket/contract
+         racket/contract/base
          racket/match
          "../util/eomap.rkt"
          "deriv-util.rkt"

collects/macro-debugger/model/reductions-engine.rkt

@@ -2,7 +2,7 @@
 (require (for-syntax racket/base
                      syntax/parse
                      syntax/parse/experimental/contract)
-         racket/contract
+         racket/contract/base
          syntax/stx
          "deriv-util.rkt"
          "stx-util.rkt"

collects/macro-debugger/stepper.rkt

@@ -1,6 +1,6 @@
 #lang racket/base
 (require racket/class
-         racket/contract
+         racket/contract/base
          unstable/class-iop
          "model/trace.rkt"
          "view/interfaces.rkt"

collects/macro-debugger/syntax-browser/frame.rkt

@@ -1,7 +1,6 @@
 #lang racket/base
 (require racket/class
          racket/gui/base
-         racket/list
          unstable/class-iop
          "interfaces.rkt"
          "partition.rkt"

collects/macro-debugger/syntax-browser/image.rkt

@@ -1,5 +1,5 @@
 #lang racket/base
-(require racket/contract
+(require racket/contract/base
          racket/class
          racket/gui/base
          framework

collects/macro-debugger/syntax-browser/interfaces.rkt

@@ -1,6 +1,5 @@
 #lang racket/base
-(require racket/class
+(require unstable/class-iop
-         unstable/class-iop
          (for-syntax racket/base))
 (provide (all-defined-out))
 

collects/macro-debugger/syntax-browser/prefs.rkt

@@ -1,6 +1,6 @@
 #lang racket/base
 (require racket/class
-         framework
+         framework/preferences
          "interfaces.rkt"
          unstable/gui/notify
          unstable/gui/prefs)

collects/macro-debugger/syntax-browser/pretty-printer.rkt

@@ -1,6 +1,5 @@
 #lang racket/base
-(require racket/list
+(require racket/class
-         racket/class
          racket/pretty
          racket/gui/base
          racket/promise

collects/macro-debugger/syntax-browser/text.rkt

@@ -3,7 +3,7 @@
          racket/gui/base
          data/interval-map
          drracket/arrow
-         framework/framework
+         framework
          data/interval-map
          "interfaces.rkt")
 

collects/macro-debugger/util/eomap.rkt

@@ -1,5 +1,5 @@
 #lang racket/base
-(require racket/contract
+(require racket/contract/base
          racket/dict
          racket/match)
 

collects/macro-debugger/util/stxobj.rkt

@@ -1,5 +1,5 @@
 #lang racket/base
-(require (rename-in racket/contract [-> c:->])
+(require (rename-in racket/contract/base [-> c:->])
          ffi/unsafe)
 
 (define lib (ffi-lib #f))

collects/macro-debugger/view/prefs.rkt

@@ -1,6 +1,6 @@
 #lang racket/base
 (require racket/class
-         framework
+         framework/preferences
          "interfaces.rkt"
          "../syntax-browser/prefs.rkt"
          unstable/gui/notify

collects/unstable/find.rkt

@@ -1,5 +1,5 @@
 #lang racket/base
-(require racket/contract
+(require racket/contract/base
          unstable/struct)
 
 (provide/contract