[spc476]

Forth as well. ANS Forth defines the word SEE <https://forth-standard.org/standard/tools/SEE> that shows the current source of a given word.

[lebuffon]

Minor caveat on SEE. If the Forth implementation uses "threaded" code the resulting source code can be quite close to the original text.

If the Forth compiler generates native code the one-to-one relationship with the source is lost and SEE will typically show the compiled code as Assembly Language.