segfault showing type with union field

[simonster]

  | | |_| | | | (_| |  |  Version 0.7.0-DEV.1386 (2017-08-18 22:41 UTC)
 _/ |\__'_|_|_|\__'_|  |  Commit feaa2f6* (0 days old master)
|__/                   |  x86_64-apple-darwin16.7.0


julia> struct BitsUnion
                  x::Union{Int64,Float64}
              end

julia> bitsunion = BitsUnion(5.0)
BitsUnion(
signal (11): Segmentation fault: 11
while loading no file, in expression starting on line 0
jl_new_bits_internal at /usr/local/julia/src/datatype.c:497
jl_new_bits at /usr/local/julia/src/datatype.c:526
jl_get_nth_field at /usr/local/julia/src/datatype.c:785
jl_f_getfield at /usr/local/julia/src/builtins.c:628
show_default at ./show.jl:150
jl_call_fptr_internal at /usr/local/julia/src/./julia_internal.h:366
jl_call_method_internal at /usr/local/julia/src/./julia_internal.h:385
jl_apply_generic at /usr/local/julia/src/gf.c:1940
jl_apply at /usr/local/julia/src/./julia.h:1447
jl_invoke at /usr/local/julia/src/gf.c:51
show at ./replutil.jl:4
unknown function (ip: 0x111392236)
jl_call_fptr_internal at /usr/local/julia/src/./julia_internal.h:366
jl_call_method_internal at /usr/local/julia/src/./julia_internal.h:385
jl_apply_generic at /usr/local/julia/src/gf.c:1940
display at ./repl/REPL.jl:125
unknown function (ip: 0x1113920b6)
jl_call_fptr_internal at /usr/local/julia/src/./julia_internal.h:366
jl_call_method_internal at /usr/local/julia/src/./julia_internal.h:385
jl_apply_generic at /usr/local/julia/src/gf.c:1940
display at ./repl/REPL.jl:128
unknown function (ip: 0x111391d76)
jl_call_fptr_internal at /usr/local/julia/src/./julia_internal.h:366
jl_call_method_internal at /usr/local/julia/src/./julia_internal.h:385
jl_apply_generic at /usr/local/julia/src/gf.c:1940
display at ./multimedia.jl:277
inner at ./essentials.jl:605
jl_call_fptr_internal at /usr/local/julia/src/./julia_internal.h:366
jl_call_method_internal at /usr/local/julia/src/./julia_internal.h:385
jl_apply_generic at /usr/local/julia/src/gf.c:1940
jl_apply at /usr/local/julia/src/./julia.h:1447
jl_f__apply at /usr/local/julia/src/builtins.c:435
jl_f__apply_latest at /usr/local/julia/src/builtins.c:473
print_response at ./repl/REPL.jl:146
jlcall_print_response_22513 at /usr/local/julia/usr/lib/julia/sys-debug.dylib (unknown line)
jl_call_fptr_internal at /usr/local/julia/src/./julia_internal.h:366
jl_call_method_internal at /usr/local/julia/src/./julia_internal.h:385
jl_apply_generic at /usr/local/julia/src/gf.c:1940
print_response at ./repl/REPL.jl:132
jlcall_print_response_22508 at /usr/local/julia/usr/lib/julia/sys-debug.dylib (unknown line)
jl_call_fptr_internal at /usr/local/julia/src/./julia_internal.h:366
jl_call_method_internal at /usr/local/julia/src/./julia_internal.h:385
jl_apply_generic at /usr/local/julia/src/gf.c:1940
do_respond at ./repl/REPL.jl:658
unknown function (ip: 0x11138fb81)
jl_call_fptr_internal at /usr/local/julia/src/./julia_internal.h:366
jl_call_method_internal at /usr/local/julia/src/./julia_internal.h:385
jl_apply_generic at /usr/local/julia/src/gf.c:1940
do_call at /usr/local/julia/src/interpreter.c:70
eval at /usr/local/julia/src/interpreter.c:262
eval_body at /usr/local/julia/src/interpreter.c:539
jl_toplevel_eval_body at /usr/local/julia/src/interpreter.c:511
jl_toplevel_eval_flex at /usr/local/julia/src/toplevel.c:601
jl_toplevel_eval at /usr/local/julia/src/toplevel.c:630
jl_toplevel_eval_in at /usr/local/julia/src/builtins.c:505
eval at ./repl/LineEdit.jl:3
jl_call_fptr_internal at /usr/local/julia/src/./julia_internal.h:366
jl_call_method_internal at /usr/local/julia/src/./julia_internal.h:385
jl_apply_generic at /usr/local/julia/src/gf.c:1940
run_interface at ./repl/LineEdit.jl:1646
jl_call_fptr_internal at /usr/local/julia/src/./julia_internal.h:366
jl_call_method_internal at /usr/local/julia/src/./julia_internal.h:385
jl_apply_generic at /usr/local/julia/src/gf.c:1940
run_frontend at ./repl/REPL.jl:961
run_repl at ./repl/REPL.jl:182
jl_call_fptr_internal at /usr/local/julia/src/./julia_internal.h:366
jl_call_method_internal at /usr/local/julia/src/./julia_internal.h:385
jl_apply_generic at /usr/local/julia/src/gf.c:1940
_start at ./client.jl:425
jl_call_fptr_internal at /usr/local/julia/src/./julia_internal.h:366
jl_call_method_internal at /usr/local/julia/src/./julia_internal.h:385
jl_apply_generic at /usr/local/julia/src/gf.c:1940
jl_apply at /usr/local/julia/julia (unknown line)
true_main at /usr/local/julia/julia (unknown line)
main at /usr/local/julia/julia (unknown line)
Allocations: 2635042 (Pool: 2634565; Big: 477); GC: 5
fish: '/usr/local/julia/julia' terminated by signal SIGSEGV (Address boundary error)

[quinnj]

Same as #23351