body used in for-loop:
for(... in ...) <body>
allows to attach additional information to the node
the original string retrieved from R, can be used for further identification
The location may differ from what is stated in Source#fullRange as it represents the location identified by the R parser.
Readonly
typevariable used in for-loop:
for(<variable> in ...) ...
vector used in for-loop:
for(... in <vector>) ...