Assign inside try behaviour not up to specification

[simonmalmgren]

An assign inside a try will be passed to all statements in the block. According to specification it should only be passed to the current statement and its children.

Because of the way the pages and blocks are processed, the values of user-defined
variables assigned or reassigned inside a try block cannot be passed to statements
outside the block or to other statements inside the block; they can be used only in
the specific statement and its children.

(p51 ESI developer guide)