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diff --git a/core/base/fndef.moon b/core/base/fndef.moon
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+----
+-- `alive` user-function definition (`fndef`).
+--
+-- When called, expands to its body with params bound to the fn arguments (see
+-- `invoke.fn_invoke`).
+--
+-- @classmod FnDef
+
+class FnDef
+  --- create a new instance
+  --
+  -- @tparam {Value,...} params (`\quote`d) naming the function parameters
+  -- @tparam AST body (`\quote`d) expression the function evaluates to
+  -- @tparam Scope scope the lexical scope the function was defined in (closure)
+  new: (@params, @body, @scope) =>
+
+  __tostring: =>
+    "(fn (#{table.concat [p\stringify! for p in *@params], ' '}) ...)"
+
+{
+  :FnDef
+}