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diff --git a/src/interp/i-code.boot b/src/interp/i-code.boot
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--- 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.
-
-
---% Interpreter Code Generation Routines
-
---Modified by JHD 9/9/93 to fix a problem with coerces inside
---interpreter functions being used as mappings. They were being
---handled with $useCoerceOrCroak being NIL, and therefore internal
---coercions were not correctly handled. Fix: remove dependence
---on $useCoerceOrCroak, and test explicitly for Mapping types.
-
---% COERCE
-
-intCodeGenCOERCE(triple,t2) ==
-  -- NOTE: returns a triple
-  t1 := objMode triple
-  t1 = $EmptyMode => NIL
-  t1 = t2 => triple
-  val := objVal triple
-
-  -- if request is for a coerce to t2 from a coerce from
-  -- to to t1, and t1 = Void or canCoerce(t0,t2), then optimize
-
-  (val is ['coerceOrCroak,trip,t1', .]) and
-    (t0 := objCodeMode trip) and ([.,val0] := objCodeVal trip) and
-      ( (t1 = $Void) or canCoerceFrom(removeQuote t0,t2) ) =>
-         -- just generate code for coercion, don't coerce constants
-         -- might be too big
-         intCodeGenCOERCE(objNew(val0, removeQuote t0), t2)
-
-  val is ['THROW,label,code] =>
-    if label is ['QUOTE, l] then label := l
-    null($compilingMap) or (label ^= mapCatchName($mapName)) =>
-      objNew(['THROW,label,wrapped2Quote objVal
-        intCodeGenCOERCE(objNew(code,t1),t2)],t2)
-    -- we have a return statement. just send it back as is
-    objNew(val,t2)
-
-  val is ['PROGN,:code,lastCode] =>
-    objNew(['PROGN,:code,wrapped2Quote objVal
-      intCodeGenCOERCE(objNew(lastCode,t1),t2)],t2)
-
-  val is ['COND,:conds] =>
-    objNew(['COND,
-      :[[p,wrapped2Quote objVal intCodeGenCOERCE(objNew(v,t1),t2)]
-        for [p,v] in conds]],t2)
-
-  -- specially handle subdomain
-  absolutelyCanCoerceByCheating(t1,t2) => objNew(val,t2)
-
-  -- specially handle coerce to Any
-  t2 = '(Any) => objNew(['CONS,MKQ t1,val],t2)
-
-  -- optimize coerces from Any
-  (t1 = '(Any)) and (val is [ ='CONS,t1',val']) =>
-    intCodeGenCOERCE(objNew(val',removeQuote t1'),t2)
-
-  -- specially handle coerce from Equation to Boolean
-  (t1 is ['Equation,:.]) and (t2 = $Boolean) =>
-    coerceByFunction(triple,t2)
-
-  -- next is hack for if-then-elses
-  (t1 = '$NoValueMode) and (val is ['COND,pred]) =>
-    code :=
-      ['COND,pred,
-        [MKQ true,['throwKeyedMsg,MKQ "S2IM0016",MKQ $mapName]]]
-    objNew(code,t2)
-
-  -- optimize coerces to Expression
-  t2 = $OutputForm =>
-    coerceByFunction(triple,t2)
-
-  isSubDomain(t1, $Integer) =>
-    intCodeGenCOERCE(objNew(val, $Integer), t2)
-
-  -- generate code
-  -- 1. See if the coercion will go through (absolutely)
-  --    Must be careful about variables or else things like
-  --    P I --> P[x] P I might not have the x in the original polynomial
-  --    put in the correct place
-
-  (not containsVariables(t2)) and canCoerceByFunction(t1,t2) =>
-    -- try coerceByFunction
-    (not canCoerceByMap(t1,t2)) and
-      (code := coerceByFunction(triple,t2)) => code
-    intCodeGenCoerce1(val,t1,t2)
-
-  -- 2. Set up a failure point otherwise
-
-  intCodeGenCoerce1(val,t1,t2)
-
-intCodeGenCoerce1(val,t1,t2) ==
-  -- Internal function to previous one
-  -- designed to ensure that we don't use coerceOrCroak on mappings
---(t2 is ['Mapping,:.]) => THROW('coerceOrCroaker, 'croaked)
-  objNew(['coerceOrCroak,mkObjCode(['wrap,val],t1),
-        MKQ t2, MKQ $mapName],t2)
-
---% Map components
-
-wrapMapBodyWithCatch body ==
-  -- places a CATCH around the map body
-  -- note that we will someday have to fix up the catch identifier
-  -- to use the generated internal map name
-  $mapThrowCount = 0 => body
-  if body is ['failCheck,['coerceOrFail,trip,targ,mapn]]
-    then
-      trip is ['LIST,v,m,e] =>
-        ['failCheck,['coerceOrFail,
-          ['LIST,['CATCH,MKQ mapCatchName $mapName, v],m,e],targ,mapn]]
-      keyedSystemError("S2GE0016",['"wrapMapBodyWithCatch",
-        '"bad CATCH for in function form"])
-    else ['CATCH,MKQ mapCatchName $mapName,body]