Moving session id out of jet tag.

tests/testjet.jet

@@ -25,6 +25,8 @@
  <set name="nested" expr="(2*(4+4)/$[divisor])*32" />
  <set name="error" value="$[nested]" />
  $[nested]
+ |>This should be passed $[error] by the parser without parsing. 
+ <set name="pass" value="not set" /><| 
  <set name="numbers">0123456789</set>
  $[numbers]
  <set name="exprnumbers" expr="$[numbers]" />