./issue2260-1.p4i(11): [--Werror=type-error] error: f
        bit<8> y = f(255);
                   ^^^^^^
  ---- Actual error:
  'int' type can only be unified with 'int', 'bit<>', or 'signed<>' types, not with '<returned type>'
  ---- Originating from:
  ./issue2260-1.p4i(6): Return type 'T' cannot be used for '<returned type>'
  T f<T>(T x) {
      ^
  Where 'T' is bound to 'int'
  ---- Originating from:
  ./issue2260-1.p4i(6): Function type 'f' does not match invocation type '<Method call>'
  T f<T>(T x) {
    ^
  ./issue2260-1.p4i(11)
          bit<8> y = f(255);
                     ^^^^^^