removed useless requires

original commit: 40439aa4efea8dc06d6b17756355571410e81888

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

@@ -1,11 +1,7 @@
 #lang racket/base
 (require racket/contract
          racket/match
-         racket/dict
          unstable/struct
-         syntax/modresolve
-         syntax/stx
-         syntax/id-table
          macro-debugger/model/deriv
          "private/reftable.rkt"
          "private/nom-use-alg.rkt"

collects/macro-debugger/model/reductions.rkt

@@ -3,7 +3,6 @@
          racket/match
          syntax/stx
          "../util/eomap.rkt"
-         "stx-util.rkt"
          "deriv-util.rkt"
          "deriv.rkt"
          "reductions-engine.rkt")

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

@@ -1,8 +1,6 @@
 #lang racket/base
 (require racket/class
          racket/gui/base
-         racket/list
-         racket/pretty
          racket/promise
          data/interval-map
          framework

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

@@ -1,7 +1,6 @@
 #lang racket/base
 (require racket/pretty
          unstable/class-iop
-         syntax/stx
          unstable/struct
          "interfaces.rkt"
          "../model/stx-util.rkt")

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

@@ -1,6 +1,5 @@
 #lang racket/base
-(require racket/list
-         racket/class
+(require racket/class
          racket/gui/base
          data/interval-map
          drracket/arrow

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

@@ -1,7 +1,6 @@
 #lang racket/base
 (require racket/class
          racket/gui/base
-         racket/list
          racket/match
          framework
          syntax/id-table

collects/macro-debugger/view/extensions.rkt

@@ -1,8 +1,5 @@
 #lang racket/base
 (require racket/class
-         racket/unit
-         racket/list
-         racket/match
          racket/gui/base
          unstable/class-iop
          "interfaces.rkt"

collects/macro-debugger/view/frame.rkt

@@ -1,10 +1,6 @@
 #lang racket/base
 (require racket/class
-         racket/unit
-         racket/list
-         racket/file
          racket/path
-         racket/match
          racket/gui/base
          framework
          unstable/class-iop

collects/macro-debugger/view/hiding-panel.rkt

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

collects/macro-debugger/view/step-display.rkt

@@ -1,7 +1,5 @@
 #lang racket/base
 (require racket/class
-         racket/unit
-         racket/list
          racket/match
          racket/gui/base
          unstable/class-iop

collects/macro-debugger/view/stepper.rkt

@@ -1,10 +1,7 @@
 #lang racket/base
 (require racket/class
-         racket/unit
-         racket/list
          racket/match
          racket/gui/base
-         racket/pretty
          unstable/class-iop
          "interfaces.rkt"
          "extensions.rkt"

collects/macro-debugger/view/term-record.rkt

@@ -1,9 +1,6 @@
 #lang racket/base
 (require racket/class
-         racket/unit
-         racket/list
          racket/match
-         racket/gui/base
          syntax/stx
          unstable/find
          unstable/class-iop

collects/macro-debugger/view/view.rkt

@@ -1,13 +1,11 @@
 #lang racket/base
 (require racket/class
-         racket/pretty
          racket/gui/base
          framework
          unstable/class-iop
          "interfaces.rkt"
          "frame.rkt"
-         "prefs.rkt"
-         "../model/trace.rkt")
+         "prefs.rkt")
 (provide macro-stepper-director%
          macro-stepper-frame%)