* commit '66dd1d68':
  do not re-wrap frames
  small cleanup in ReadVariableNode
  cheaper checks in several places
  do not use auto-generated expectDouble, etc. functions
  move value profile in ReadVariableNode to an earlier position
  use boolean frame slot for visibility
  ensure that Operations do not throw arbitrary exceptions

Merge pull request #399 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:print_with_s4_show to master

* commit '35ddf1f6':
  use "show" instead of "print" to display S4 objects

Merge pull request #401 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:null_on_unknown_message to master

* commit 'dd4fdf1f':
  return null instead of throwing RInternalErrors on unknown interop messages

* commit 'a7dcbfe4':
  call_rffi: remove debugging code

Merge pull request #392 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:feature/rec-specials to master

* commit 'b410472f':
  Fix BinaryArithmeticSpecial for NaN vs NA values
  Arguments of specials can be other specials

Merge pull request #396 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:fix/fortran-truffle-boundary to master

* commit 'a97d87a6':
  Add @TruffleBoundary over Fortran.lookup method

* commit 'e490bbe3':
  enable passing tests
  use new DSL layout in .Internal and RCallNode
  node costs in ShareObjectNode, some "final" attributes on classes
  make VectorPrinter more resilient to "null" values
  fix wrong dimensions in Rf_allocMatrix
  ensure that builtin-RFunctions are only created once
  intern names during attribute updates
  represent empty capture names as ""
  support creating function expressions with "call"
  implement SETCADR, fixes to other SET functions
  update capabilities bultins
  print internal error messages if appropriate
  call "print" functions for list elements and attributes
  correct treatment for the names of dimnames in vector extract
  bugfixes in various bultins
  "length" has internal generic dispatch
  do not allow bultins to return "null"

The bailout is then recursive.

Merge pull request #394 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:specialcall_profiles to master

* commit '36f542d4':
  ValueProfile in RCallSpecialNode