Credo.Code.postwalk

You're seeing just the function postwalk, go back to Credo.Code module for more information.
Link to this function

postwalk(ast_or_source_file, fun, accumulator \\ [])

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Postwalks a given Credo.SourceFile's AST or a given AST.

Technically this is just a wrapper around Macro.postwalk/3.