tail-call-non-self-merge-switch

As with all compiler switch variables, the value of this variable can be t, nil, or a function object that accepts five arguments and returns t or nil. The arguments passed to the function will be the values of the safety, space, speed, debug, and compilation-speed optimization qualities, in that order. nil is equivalent to a function that always returns nil and t to a function that always returns t. When the value is a function and we say t (or true) or nil (or false) in the text below, we mean that the function returns, respectively, t or nil.

If true, compiler will perform non-self-tail-merging (for functions in the tail position different than the function being executed). This switch will affect code only when true at the point of the call.

See Tail merging discussion for more information on tail-merging. Initially true if speed is greater than 1 and debug less than 2.

See compiling.htm for information on the compiler.

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Created 2016.6.21.