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`macrostep-mode' is a minor mode for interactively stepping through the expansion of macros in Emacs Lisp source code. It lets you see exactly what happens at each step of the expansion process by pretty-printing the expanded forms inline in the source buffer, which is read-only while macro expansions are visible. You can expand and collapse macro forms one step at a time, and evaluate or instrument them for debugging with Edebug as normal (but see "Bugs and known limitations", below). Single-stepping through the expansion is useful for debugging macros that expand into another macro form, especially one like `lexical-let' that does significant rewriting. These can be difficult to debug with Emacs' built-in `macroexpand' because `macroexpand' continues expansion until the top-level form is no longer a macro call. macrostep-mode adds some simple additional fontification to macro-expanded text. The heads of macro sub-forms are fontified using `macrostep-macro-face'. Uninterned symbols (gensyms) are fontified based on which step in the expansion created them, to distinguish them from normal symbols and from other gensyms with the same print name. Use `customize-group' with the "macrostep" group to customize these faces. See the "Commentary" section of "macrostep.el" for more.