3 files changed, 12 insertions, 11 deletions
diff --git a/src/interp/i-spec1.boot b/src/interp/i-spec1.boot
index f8820697..c3690278 100644
--- a/src/interp/i-spec1.boot
+++ b/src/interp/i-spec1.boot
@@ -345,24 +345,24 @@ upcase t ==
         if d is [":",=rhs,.] then rhstag := i
      if NULL rhstag then error '"upcase: bad Union form"
      $genValue =>
-        rhstag = first unwrap objVal triple => code := wrap 'TRUE
-        code := wrap NIL
+        rhstag = first unwrap objVal triple => code := wrap true
+        code := wrap false
      code :=
         ["COND",
           [["EQL",rhstag,["CAR",["unwrap",objVal triple]]],
-            ''TRUE],
-              [''T,NIL]]
+            true],
+              [''T,false]]
   else
     $genValue =>
         t' := coerceUnion2Branch triple
-        rhs = objMode t' => code := wrap 'TRUE
-        code := wrap NIL
+        rhs = objMode t' => code := wrap true
+        code := wrap false
     triple' := objNewCode(["wrap",objVal triple],objMode triple)
     code :=
         ["COND",
           [["EQUAL",MKQ rhs,["objMode",['coerceUnion2Branch,triple']]],
-            ''TRUE],
-              [''T,NIL]]
+            true],
+              [''T,false]]
   putValue(op,objNew(code,$Boolean))
   putModeSet(op,[$Boolean])
 
diff --git a/src/interp/i-spec2.boot b/src/interp/i-spec2.boot
index fb5079a6..22f97447 100644
--- a/src/interp/i-spec2.boot
+++ b/src/interp/i-spec2.boot
@@ -408,8 +408,8 @@ evalIsPredicate(value,pattern,mode) ==
   false
 
 evalIsntPredicate(value,pattern,mode) ==
-  evalIsPredicate(value,pattern,mode) => NIL
-  'TRUE
+  evalIsPredicate(value,pattern,mode) => false
+  true
 
 removeConstruct pat ==
   -- removes the "construct" from the beginning of patterns
diff --git a/src/interp/sys-utility.boot b/src/interp/sys-utility.boot
index 441d356e..20e84c18 100644
--- a/src/interp/sys-utility.boot
+++ b/src/interp/sys-utility.boot
@@ -172,7 +172,8 @@ makeAbsoluteFilename name ==
 
 ++ returns true if `file' exists as a pathname.
 existingFile? file ==
-  PROBE_-FILE file
+  PROBE_-FILE file => true
+  false
 
 ++ original version returned 0 on success, and 1 on failure
 ++ ??? fix that to return -1 on failure.