improve completion for debugger commands

compiler/ghci/InteractiveUI.hs

@@ -109,14 +109,14 @@ builtin_commands = [
 	-- Hugs users are accustomed to :e, so make sure it doesn't overlap
   ("?",		keepGoing help,			False, completeNone),
   ("add",	keepGoingPaths addModule,	False, completeFilename),
-  ("break",     breakCmd, False, completeNone),   
+  ("break",     breakCmd,                       False, completeIdentifier),
   ("browse",    keepGoing browseCmd,		False, completeModule),
   ("cd",    	keepGoing changeDirectory,	False, completeFilename),
   ("check",	keepGoing checkModule,		False, completeHomeModule),
-  ("continue",  continueCmd, False, completeNone),
+  ("continue",  continueCmd,                    False, completeNone),
   ("ctags",	keepGoing createCTagsFileCmd, 	False, completeFilename),
   ("def",	keepGoing defineMacro,		False, completeIdentifier),
-  ("delete",    deleteCmd, False, completeNone),   
+  ("delete",    deleteCmd,                      False, completeNone),
   ("e", 	keepGoing editFile,		False, completeFilename),
   ("edit",	keepGoing editFile,		False, completeFilename),
   ("etags",	keepGoing createETagsFileCmd,	False, completeFilename),
@@ -124,7 +124,7 @@ builtin_commands = [
   ("help",	keepGoing help,			False, completeNone),
   ("info",      keepGoing info,			False, completeIdentifier),
   ("kind",	keepGoing kindOfType,		False, completeIdentifier),
-  ("load",	keepGoingPaths loadModule_,False, completeHomeModuleOrFile),
+  ("load",	keepGoingPaths loadModule_,     False, completeHomeModuleOrFile),
   ("module",	keepGoing setContext,		False, completeModule),
   ("main",	keepGoing runMain,		False, completeIdentifier),
   ("print",     keepGoing (pprintClosureCommand True False), False, completeIdentifier),
@@ -133,7 +133,7 @@ builtin_commands = [
   ("set",	keepGoing setCmd,		True,  completeSetOptions),
   ("show",	keepGoing showCmd,		False, completeNone),
   ("sprint",    keepGoing (pprintClosureCommand False False),False, completeIdentifier),
-  ("step",      stepCmd, False, completeNone), 
+  ("step",      stepCmd,                        False, completeIdentifier), 
   ("type",	keepGoing typeOfExpr,		False, completeIdentifier),
   ("undef",     keepGoing undefineMacro,	False, completeMacro),
   ("unset",	keepGoing unsetOptions,		True,  completeSetOptions)