local debuginfo = debug.getinfo (1)
local fnName = debug.getinfo (1,"n").name

• f - returns “func” field
• l - returns “currentline” field
• L - returns a table whose indices are the numbers of the lines that are valid on the function. (A valid line is a line with some associated code, that is, a line where you can put a break point. Non-valid lines include empty lines and comments.)
• n - returns “name” and “namewhat” fields
• S - returns “source”, “short_src”, “linedefined” and “what” fields
• u - returns “nups” field

Tracing