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diff --git a/src/interp/g-error.boot b/src/interp/g-error.boot
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--- a/src/interp/g-error.boot
+++ /dev/null
@@ -1,199 +0,0 @@
--- Copyright (c) 1991-2002, The Numerical ALgorithms Group Ltd.
--- All rights reserved.
---
--- Redistribution and use in source and binary forms, with or without
--- modification, are permitted provided that the following conditions are
--- met:
---
---     - Redistributions of source code must retain the above copyright
---       notice, this list of conditions and the following disclaimer.
---
---     - Redistributions in binary form must reproduce the above copyright
---       notice, this list of conditions and the following disclaimer in
---       the documentation and/or other materials provided with the
---       distribution.
---
---     - Neither the name of The Numerical ALgorithms Group Ltd. nor the
---       names of its contributors may be used to endorse or promote products
---       derived from this software without specific prior written permission.
---
--- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
--- IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
--- TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
--- PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
--- OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
--- EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
--- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
--- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
--- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
--- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
--- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
-import '"diagnostics"
-)package "BOOT"
-
--- This file contains the error printing code used in BOOT and SPAD.
--- While SPAD only calls "error" (which is then labeled as an algebra
--- error, BOOT calls "userError" and "systemError" when a problem is
--- found.
---
--- The variable $BreakMode is set using the system command )set breakmode
--- and can have one of the values:
---   break    -- always enter a lisp break when an error is signalled
---   nobreak  -- do not enter lisp break mode
---   query    -- ask the user if break mode should be entered
-
-SETANDFILEQ($SystemError,'SystemError)
-SETANDFILEQ($UserError,'UserError)
-SETANDFILEQ($AlgebraError,'AlgebraError)
-
--- REDERR is used in BFLOAT LISP, should be a macro
--- REDERR msg == error msg
-
--- BFLERRMSG func ==
---  errorSupervisor($AlgebraError,STRCONC(
---    '"BigFloat: invalid argument to ",func))
-
-argumentDataError(argnum, condit, funname) ==
-  msg := ['"The test",:bright pred2English condit,'"evaluates to",
-    :bright '"false",'%l,'"   for argument",:bright argnum,_
-    '"to the function",:bright funname,'"and this indicates",'%l,_
-    '"   that the argument is not appropriate."]
-  errorSupervisor($AlgebraError,msg)
-
-queryUser msg ==
-  -- display message and return reply
-  sayBrightly msg
-  READ_-LINE _*TERMINAL_-IO_*
-
--- errorSupervisor is the old style error message trapper
-
-errorSupervisor(errorType,errorMsg) ==
-  errorSupervisor1(errorType,errorMsg,$BreakMode)
-
-errorSupervisor1(errorType,errorMsg,$BreakMode) ==
-  $cclSystem and $BreakMode = 'trapNumerics => 
-    THROW('trapNumerics,$numericFailure)
-  BUMPERRORCOUNT "semantic"
-  errorLabel :=
-      errorType = $SystemError  => '"System error"
-      errorType = $UserError    => '"Apparent user error"
-      errorType = $AlgebraError =>
-        '"Error detected within library code"
-      STRINGP errorType         => errorType
-      '"Error with unknown classification"
-  msg :=
-    errorMsg is ['mathprint, :.] => errorMsg
-    not PAIRP errorMsg => ['"   ", errorMsg]
-    splitmsg := true
-    if member('%b,errorMsg) then splitmsg := nil
-      else if member('%d,errorMsg) then splitmsg := nil
-           else if member('%l,errorMsg) then splitmsg := nil
-    splitmsg => CDR [:['%l,'"   ",u] for u in errorMsg]
-    ['"   ",:errorMsg]
-  sayErrorly(errorLabel, msg)
-  handleLispBreakLoop($BreakMode)
-
-handleLispBreakLoop($BreakMode) ==
-  TERPRI()
-  -- The next line is to try to deal with some reported cases of unwanted
-  -- backtraces appearing, MCD.
-  ENABLE_-BACKTRACE(nil)
-  $BreakMode = 'break =>
-    sayBrightly '" "
-    BREAK()
-  $BreakMode = 'query =>
-    gotIt := nil
-    while not gotIt repeat
-      gotIt := true
-      msgQ := 
-       $cclSystem =>
-         ['%l,'"   You have two options. Enter:",'%l,_
-          '"    ",:bright '"top     ",'"  to return to top level, or",'%l,_
-          '"    ",:bright '"break   ",'"  to enter a LISP break loop.",'%l,_
-          '%l,'"   Please enter your choice now:"]
-       ['%l,'"   You have three options. Enter:",'%l,_
-        '"    ",:bright '"continue",'"  to continue processing,",'%l,_
-        '"    ",:bright '"top     ",'"  to return to top level, or",'%l,_
-        '"    ",:bright '"break   ",'"  to enter a LISP break loop.",'%l,_
-        '%l,'"   Please enter your choice now:"]
-      x := STRING2ID_-N(queryUser msgQ,1)
-      x := 
-        $cclSystem =>
-          selectOptionLC(x,'(top break),NIL)
-        selectOptionLC(x,'(top break continue),NIL)
-      null x =>
-        sayBrightly bright '"  That was not one of your choices!"
-        gotIt := NIL
-      x = 'top => returnToTopLevel()
-      x = 'break =>
-        $BreakMode := 'break
-        if not $cclSystem then
-          sayBrightly ['"   Enter",:bright '":C",
-            '"when you are ready to continue processing where you ",'%l,_
-            '"   interrupted the system, enter",:bright '"(TOP)",_
-            '"when you wish to return",'%l,'"   to top level.",'%l,'%l]
-        BREAK()
-      sayBrightly
-        '"   Processing will continue where it was interrupted."
-      THROW('SPAD__READER, nil)
-  $BreakMode = 'resume =>
-    returnToReader()
-  returnToTopLevel()
-
-TOP() == returnToTopLevel()
-
-returnToTopLevel() ==
-  SETQ(CHR, "ENDOFLINECHR")
-  SETQ(TOK, 'END__UNIT)
-  TOPLEVEL()
-
-returnToReader() ==
-  ^$ReadingFile => returnToTopLevel()
-  sayBrightly ['"   Continuing to read the file...", '%l]
-  THROW('SPAD__READER, nil)
-
-sayErrorly(errorLabel, msg) ==
-  $saturn => saturnSayErrorly(errorLabel, msg)
-  sayErrorly1(errorLabel, msg)
-
-saturnSayErrorly(errorLabel, msg) ==
-  _*STANDARD_-OUTPUT_* : fluid := $texOutputStream
-  old := pushSatOutput("line")
-  sayString '"\bgroup\color{red}"
-  sayString '"\begin{verbatim}"
-  sayErrorly1(errorLabel, msg)
-  sayString '"\end{verbatim}"
-  sayString '"\egroup"
-  popSatOutput(old)
-
-sayErrorly1(errorLabel, msg) ==
-  sayBrightly '" "
-  if $testingSystem then sayMSG $testingErrorPrefix
-  sayBrightly ['"   >> ",errorLabel,'":"]
-  m := msg
-  msg is ['mathprint, mathexpr] =>
-    mathprint mathexpr
-  sayBrightly msg
-
--- systemError is being phased out. Please use keyedSystemError.
-systemError(:x) == errorSupervisor($SystemError,IFCAR x)
-
--- unexpectedSystemError() ==
---  systemError '"Oh, no.  Unexpected internal error."
-
-userError x == errorSupervisor($UserError,x)
-
-error(x) == errorSupervisor($AlgebraError,x)
-
-IdentityError(op) ==
-    error(["No identity element for reduce of empty list using operation",op])
-
-throwMessage(:msg) ==
-  if $compilingMap then clearCache $mapName
-  msg' := mkMessage concatList msg
-  sayMSG msg'
-  if $printMsgsToFile then sayMSG2File msg'
-  spadThrow()
-