RFC: Additional string tests for #11885

[ghost]

A stab at increasing test coverage for string.jl.

[ghost]

CI failures appears to be unrelated.

[tkelman]

@vtjnash does this backtrace from 32 bit travis resemble your theory about codegen inside finalizers?

signal (11): Segmentation fault
unknown function (ip: 0xb6fc5e69)
unknown function (ip: 0xb7350780)
unknown function (ip: 0xb73508ae)
unknown function (ip: 0xb735098d)
unknown function (ip: 0xb6df518c)
unknown function (ip: 0xb6df57de)
unknown function (ip: 0xb6df59da)
jl_generate_fptr at /home/travis/build/JuliaLang/julia/src/codegen.cpp:860
jl_trampoline_compile_function at /home/travis/build/JuliaLang/julia/src/builtins.c:964
jl_apply at /home/travis/build/JuliaLang/julia/src/julia.h:1346
run_finalizers at /home/travis/build/JuliaLang/julia/src/gc.c:153
__pool_alloc at /home/travis/build/JuliaLang/julia/src/gc.c:1053
jl_set_typeof at /home/travis/build/JuliaLang/julia/src/julia.h:117
jl_alloc_array_1d at /home/travis/build/JuliaLang/julia/src/array.c:331
jl_alloc_cell_1d at /home/travis/build/JuliaLang/julia/src/array.c:380
jl_gc_wb at /home/travis/build/JuliaLang/julia/src/julia.h:589
emit_expr at /home/travis/build/JuliaLang/julia/src/codegen.cpp:3285
emit_function at /home/travis/build/JuliaLang/julia/src/codegen.cpp:4690
jl_compile at /home/travis/build/JuliaLang/julia/src/codegen.cpp:908
jl_trampoline_compile_function at /home/travis/build/JuliaLang/julia/src/builtins.c:963
jl_apply at /home/travis/build/JuliaLang/julia/src/julia.h:1346
run_finalizers at /home/travis/build/JuliaLang/julia/src/gc.c:153
jl_atexit_hook at /home/travis/build/JuliaLang/julia/src/init.c:569
jl_exit at /home/travis/build/JuliaLang/julia/src/jl_uv.c:450
exit at client.jl:38
jlcall_exit_21497 at  (unknown line)
jl_apply at /home/travis/build/JuliaLang/julia/src/builtins.c:976
jl_apply at /home/travis/build/JuliaLang/julia/src/gf.c:1657
do_call at /home/travis/build/JuliaLang/julia/src/interpreter.c:66
eval at /home/travis/build/JuliaLang/julia/src/interpreter.c:212
jl_interpret_toplevel_expr at /home/travis/build/JuliaLang/julia/src/interpreter.c:28
jl_toplevel_eval_flex at /home/travis/build/JuliaLang/julia/src/toplevel.c:534
jl_toplevel_eval_flex at /home/travis/build/JuliaLang/julia/src/toplevel.c:400
jl_eh_restore_state at /home/travis/build/JuliaLang/julia/src/julia.h:1346
jl_f_top_eval at /home/travis/build/JuliaLang/julia/src/builtins.c:578
process_options at ./client.jl:293
_start at ./client.jl:405
unknown function (ip: 0xb51831d6)
jl_apply at /home/travis/build/JuliaLang/julia/src/builtins.c:976
jl_apply at /home/travis/build/JuliaLang/julia/src/gf.c:1659
unknown function (ip: 0x8049378)
unknown function (ip: 0x8048f58)
__libc_start_main at /lib/i386-linux-gnu/libc.so.6 (unknown line)
unknown function (ip: 0x8048f99)
exception on 2: ERROR: LoadError: test error in expression: readchomp(@cmd("\$exename -q -p 2 -P \"println(nworkers()); exit(0)\"")) == "2"
failed process: Process(`/tmp/julia/bin/julia -q -p 2 -P 'println(nworkers()); exit(0)'`, ProcessSignaled(11)) [0]
 in readbytes at process.jl:474
 in readchomp at io.jl:218
 in anonymous at test.jl:89
 in do_test at test.jl:49
 in anonymous at no file:69
 in include at ./boot.jl:254
 in runtests at /tmp/julia/share/julia/test/testdefs.jl:197
 in anonymous at multi.jl:837
 in run_work_thunk at multi.jl:590
 in anonymous at task.jl:837
 in readbytes at process.jl:474
 in readchomp at io.jl:218
 in anonymous at test.jl:89
 in do_test at test.jl:49
 in anonymous at no file:69
 in include at ./boot.jl:254
 in runtests at /tmp/julia/share/julia/test/testdefs.jl:197
 in anonymous at multi.jl:837
 in run_work_thunk at multi.jl:590
 in anonymous at task.jl:837
while loading /tmp/julia/share/julia/test/cmdlineargs.jl, in expression starting on line 3
    From worker 4:       * misc                 in  50.32 seconds
    From worker 5:       * ranges               in  94.64 seconds
    From worker 3:       * examples             in  45.50 seconds
ERROR: LoadError: LoadError: test error in expression: readchomp(@cmd("\$exename -q -p 2 -P \"println(nworkers()); exit(0)\"")) == "2"
failed process: Process(`/tmp/julia/bin/julia -q -p 2 -P 'println(nworkers()); exit(0)'`, ProcessSignaled(11)) [0]
 in anonymous at multi.jl:1327
 in anonymous at task.jl:1403
while loading /tmp/julia/share/julia/test/cmdlineargs.jl, in expression starting on line 3
while loading /tmp/julia/share/julia/test/runtests.jl, in expression starting on line 5
    From worker 2:       * cmdlineargs         

[vtjnash]

yes