• ← $TraceBuiltins
• → ClearTrace

$TraceEvaluation

$TraceEvaluation

A Boolean variable which when set True traces Expression evaluation calls and returns.

• • $TraceEvaluation = True

• • a + a

Setting it to False again recovers the normal behaviour:

• • $TraceEvaluation = False

• • $TraceEvaluation

• • a + a

$TraceEvaluation cannot be set to a non-boolean value.

• • $TraceEvaluation = x