splicing to the end of a one-time expression.

lib/nodes.js

@@ -1225,7 +1225,7 @@
           }
         }
       } else {
-        to = "" + name + ".length";
+        to = "9e9";
       }
       val = this.value.compile(o);
       return "[].splice.apply(" + name + ", [" + fromDecl + ", " + to + "].concat(" + val + "))";

src/nodes.coffee

@@ -982,7 +982,7 @@ exports.Assign = class Assign extends Base
         to = to.compile(o) + ' - ' + fromRef
         to += ' + 1' unless exclusive
     else
-      to = "#{name}.length"
+      to = "9e9"
     val = @value.compile(o)
     "[].splice.apply(#{name}, [#{fromDecl}, #{to}].concat(#{val}))"
 

test/ranges_slices_and_splices.coffee

@@ -163,3 +163,15 @@ test "splicing with expressions as endpoints", ->
   ary = [0..9]
   ary[a+1...2*b+1] = [4]
   arrayEq [0, 1, 4, 7, 8, 9], ary
+
+test "splicing to the end, against a one-time function", ->
+  ary = null
+  fn = ->
+    if ary
+      throw 'err'
+    else
+      ary = [1, 2, 3]
+
+  fn()[0..] = 1
+
+  arrayEq ary, [1]