@Tracing()
@Tracing(x:function, ...)
@Tracing(x:string, ...)
@Tracing(x:tab, ...)

Calling @Tracing starts to trace the calls to all functions specified by the arguments. Functions to trace are given by their name (as a string) or by their value (through their identifier) or by a tab containing such values.

With no argument, all user-defined function are traced.