Initial population.

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+\documentclass{article}
+\usepackage{axiom}
+\begin{document}
+\title{\$SPAD/src/interp i-code.boot}
+\author{The Axiom Team}
+\maketitle
+\begin{abstract}
+\end{abstract}
+\eject
+\tableofcontents
+\eject
+\section{License}
+<<license>>=
+-- 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.
+
+@
+<<*>>=
+<<license>>
+
+--% 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]
+@
+\eject
+\begin{thebibliography}{99}
+\bibitem{1} nothing
+\end{thebibliography}
+\end{document}