//Syntax
//MD:
//  method-declaration ::=
//    'public' type identifier '(' formal-list? ')' '{' 
//      var-declaration* 
//      statement* 
//      'return' expression ';' 
//    '}'
//
//Type
//  methods 
//   ~> functions(tuples(references(objects), minijava-values*), minijava-values)
//  
//Semantics
//  declare-methods[[MD*:method-declaration*]] : => envs
//Rule
//  declare-methods[['public' T ID '(' FL? ')' '{' VD* S* 'return' E ';' '}']] =
//    { id[[ID]] |->
//      function closure scope (
//        collateral ( // variables not allowed to shadow visible fields
//          match ( given,
//            tuple (
//            pattern abstraction { "this" |-> allocate-initialised-variable ( pointers(objects), given ) },
//              bind-formals[[FL?]] 
//              ) 
//          ),
//          object-single-inheritance-feature-map checked dereference first tuple-elements given, 
//          declare-variables[[VD*]] ),
//          
//        sequential ( execute[[S*]], evaluate[[E]] ) ) }