StackComplete

evaluates expr with intermediate expressions in evaluation chains included on the stack.

Details

The Wolfram System normally includes only the latest expression on each evaluation chain involved in the evaluation of a particular expression. Inside StackComplete, however, all preceding expressions on the evaluation chains are included.
StackComplete typically increases significantly the number of expressions kept on the evaluation stack.

Include intermediate expressions in the evaluation stack:

Wolfram Language code:

f[x_] := g[x ^ 2];
g[x_] := (Echo[Stack[_]];x + 1);

Wolfram Language code: StackComplete[1 + f[2]]

Without StackComplete, you do not see how f and g are used:

Wolfram Language code: 1 + f[2]

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