1869	 Block Structures Indirect Addressing and Garbage Collection	 Programming languages have included explicit or implicit block structures to provide a naming convenience for the programmer. However when indirect addressing is used as in SNOBOL naming constraints may be introduced. Two modifications to SNOBOL are described resulting in two desirable consequences naming constraints disappear even when there is indirect addressing within function definitions and there is a significant saving in the number of calls to the garbage collector because some garbage is collected at little expense each time a function returns to its calling program. These modifications have been implemented as an extension to a SNOBOL dialect. block structures indirect addressing garbage collection local names SNOBOL
