Return whether innermost non-block scope is a code scope.

@param outerType @return

Increases the stack capacity if it has no room for new entries.

Add the Stream nodes from the source index to dest using recursion. Simplest iterative traversal of the source tree wouldn't work, because we update t

Duplicate an index_stream.

Calculate the total size of the Stream

Helper for index_tree_end()

initialize rec and proj

allows one-time initialization before any mapping. This method is called before any mapping of a unit (but only once in the beginning).<br> If not ove