(defrecord name [fields*] options* specs*) Currently there are no options. Each spec consists of a protocol or interface name followed by zero or more method bodies: protocol-or-interface-or-Object (methodName [args*] body)* Dynamically generates compiled bytecode for class with the given name, in a package with the same name as the current namespace, the given fields, and, optionally, methods for protocols and/or interfaces. The class will have the (immutable) fields named by fields, which can have type hints. Protocols/interfaces and methods are optional. The only methods that can be supplied are those declared in the protocols/interfaces. Note that method bodies are not closures, the local environment includes only the named fields, and those fields can be accessed directly. Method definitions take the form: (methodname [args*] body) The argument and return types can be hinted on the arg and methodname symbols. If not supplied, they will be inferred, so type hints should be reserved for disambiguation. Methods should be supplied for all methods of the desired protocol(s) and interface(s). You can also define overrides for methods of Object. Note that a parameter must be supplied to correspond to the target object ('this' in Java parlance). Thus methods for interfaces will take one more argument than do the interface declarations. Note also that recur calls to the method head should *not* pass the target object, it will be supplied automatically and can not be substituted. In the method bodies, the (unqualified) name can be used to name the class (for calls to new, instance? etc). The class will have implementations of several (clojure.lang) interfaces generated automatically: IObj (metadata support) and IPersistentMap, and all of their superinterfaces. In addition, defrecord will define type-and-value-based =, and will defined Java .hashCode and .equals consistent with the contract for java.util.Map. When AOT compiling, generates compiled bytecode for a class with the given name (a symbol), prepends the current ns as the package, and writes the .class file to the *compile-path* directory. Two constructors will be defined, one taking the designated fields followed by a metadata map (nil for none) and an extension field map (nil for none), and one taking only the fields (using nil for meta and extension fields). Note that the field names __meta and __extmap are currently reserved and should not be used when defining your own records. Given (defrecord TypeName ...), two factory functions will be defined: ->TypeName, taking positional parameters for the fields, and map->TypeName, taking a map of keywords to field values.