locate f -- for a symbol interpreted function f returns a sequence (n,i,j) describing the location of the definition in the source code. The name of the source file is n and the code is occupies lines i through j. If the f is compiled, then the location is not available, and null is returned.
If f is a sequence, then lookup is applied first, and then the location of the resulting function is provided.
If f is null, then null is returned.
Ways to use locate :