jsrefs.nim

type A = object
  data: ref seq[float]

proc `$`[T](a:ref seq[T]):string = $(a[])

var ar : A 
new ar.data
ar.data[] = @[0.0,1.0,2.0] 

echo ar

# With C backend: nim c -r test.nim
# results in:

# (data: @[0.0, 1.0, 2.0])

# With js backend: nim js test.nim
# results in:

# test.nim(8, 8) Error: internal error: genDeref
# No stack traceback available
# To create a stacktrace, rerun compilation with ./koch temp js <file>

# And runing it with koch temp js test.nim
# results in:
#[
  test.nim(8, 8) Error: internal error: genDeref
  Traceback (most recent call last)
  nim.nim(115)             nim
  nim.nim(71)              handleCmdLine
  main.nim(272)            mainCommand
  main.nim(116)            commandCompileToJS
  modules.nim(238)         compileProject
  system.nim(1105)         compileModule
  passes.nim(198)          processModule
  passes.nim(131)          processTopLevelStmt
  jsgen.nim(2212)          myProcess
  jsgen.nim(2201)          genModule
  jsgen.nim(1994)          genStmt
  jsgen.nim(2139)          gen
  jsgen.nim(878)           genAsgn
  jsgen.nim(841)           genAsgnAux
  jsgen.nim(2097)          gen
  jsgen.nim(1182)          genDeref
  msgs.nim(994)            internalError
  msgs.nim(968)            liMessage
  msgs.nim(840)            handleError
  msgs.nim(824)            quit
  FAILURE
]#