Boom

type A = ref object
  s: seq[typedesc]
var a = A(s: @[])
# Error: internal error: getUniqueType
# Traceback (most recent call last)
# nim.nim(97)              nim
# nim.nim(61)              handleCmdLine
# main.nim(252)            mainCommand
# main.nim(63)             commandCompileToC
# modules.nim(206)         compileProject
# modules.nim(154)         compileModule
# passes.nim(193)          processModule
# passes.nim(137)          processTopLevelStmt
# cgen.nim(1217)           myProcess
# ccgstmts.nim(1113)       genStmts
# ccgexprs.nim(2067)       expr
# ccgstmts.nim(1113)       genStmts
# ccgexprs.nim(2086)       expr
# ccgstmts.nim(259)        genVarStmt
# ccgstmts.nim(242)        genSingleVar
# ccgstmts.nim(86)         loadInto
# ccgexprs.nim(2056)       expr
# ccgexprs.nim(1145)       genObjConstr
# ccgexprs.nim(1086)       rawGenNew
# ccgtypes.nim(1011)       genTypeInfo
# ccgtypes.nim(791)        genTypeInfoAux
# ccgtypes.nim(1019)       genTypeInfo
# ccgtypes.nim(876)        genObjectInfo
# ccgtypes.nim(815)        genObjectFields
# ccgtypes.nim(868)        genObjectFields
# ccgtypes.nim(1011)       genTypeInfo
# ccgtypes.nim(791)        genTypeInfoAux
# ccgtypes.nim(984)        genTypeInfo
# ccgutils.nim(102)        getUniqueType
# msgs.nim(957)            internalError
# msgs.nim(866)            rawMessage
# msgs.nim(863)            rawMessage
# msgs.nim(796)            handleError