Merge pull request probmods#387 from null-a/minor-hmc-tweaks

Minor HMC tweaks

src/inference/hmckernel.js

@@ -150,12 +150,12 @@ module.exports = function(env) {
     // variables.
     this.prevTrace = trace;
     this.trace = this.prevTrace.fresh();
-    // Once the WebPPL program has finished we need to call k to
+    // Once the WebPPL program has finished we need to call cont to
     // continue inference. Since the program will call env.exit once
-    // finished, we save k here in order to resume inference as
+    // finished, we save cont here in order to resume inference as
     // desired. Note that we can't pass a continuation other than
     // env.exit to the program. This is because the continuation is
-    // store as part of the trace, and when invoked by a different
+    // stored as part of the trace, and when invoked by a different
     // MCMC kernel execution would jump back here.
     this.positionStepCont = cont;
     return this.trace.continue();
@@ -170,7 +170,7 @@ module.exports = function(env) {
       assert(!this.trace.isComplete());
     }
     var cont = this.positionStepCont;
-    this.thisPositionStepCont = undefined;
+    this.positionStepCont = undefined;
     return cont(this.trace);
   };