test shadowing function from base

[KristofferC]

Closes #11723

[tkelman]

startup-file=no

[KristofferC]

Heh, this passes on 0.6 but on 0.7-dev we get:

WARNING: imported binding for diag overwritten in module Main
Unreachable reached at 0x7fa65d05366a

signal (4): Illegal instruction
while loading no file, in expression starting on line 0
macro expansion at ./REPL[0]:7 [inlined]
anonymous at ./<missing> (unknown line)
jl_call_fptr_internal at /home/kristoffer/julia/src/julia_internal.h:366 [inlined]
jl_call_method_internal at /home/kristoffer/julia/src/julia_internal.h:385 [inlined]
jl_toplevel_eval_flex at /home/kristoffer/julia/src/toplevel.c:594
jl_toplevel_eval_in at /home/kristoffer/julia/src/builtins.c:496
eval at ./boot.jl:236
jlcall_eval_18457 at /home/kristoffer/julia/usr/lib/julia/sys.so (unknown line)
jl_call_fptr_internal at /home/kristoffer/julia/src/julia_internal.h:366 [inlined]
jl_call_method_internal at /home/kristoffer/julia/src/julia_internal.h:385 [inlined]
jl_apply_generic at /home/kristoffer/julia/src/gf.c:1928
eval_user_input at ./repl/REPL.jl:67
jlcall_eval_user_input_20521 at /home/kristoffer/julia/usr/lib/julia/sys.so (unknown line)
jl_call_fptr_internal at /home/kristoffer/julia/src/julia_internal.h:366 [inlined]
jl_call_method_internal at /home/kristoffer/julia/src/julia_internal.h:385 [inlined]
jl_apply_generic at /home/kristoffer/julia/src/gf.c:1928
macro expansion at ./repl/REPL.jl:98 [inlined]
#1 at ./event.jl:73
unknown function (ip: 0x7fa65d04de1f)
jl_call_fptr_internal at /home/kristoffer/julia/src/julia_internal.h:366 [inlined]
jl_call_method_internal at /home/kristoffer/julia/src/julia_internal.h:385 [inlined]
jl_apply_generic at /home/kristoffer/julia/src/gf.c:1928
jl_apply at /home/kristoffer/julia/src/julia.h:1445 [inlined]
start_task at /home/kristoffer/julia/src/task.c:267
unknown function (ip: 0xffffffffffffffff)
Allocations: 1717317 (Pool: 1715911; Big: 1406); GC: 1
[1]    11070 illegal hardware instruction (core dumped)  ./julia

[KristofferC]

cc @vtjnash @JeffBezanson

[martinholters]

Bisected the crash to 753fbef. As this does not crash if either diag is renamed or the whole thing is wrapped in a function, my guess is that Triangular(lower, Base.diag, upper) is inferred, which is correctly determined as throwing a MethodError, but then Triangular(lower, diag, upper) is invoked, which does not throw, hence Unreachable reached. Sounds like #11723 has never really been fixed. Especially for #11723 (comment) I still get the same output.

[martinholters]

What's the status here?

[martinholters]

This now requires a using LinearAlgebra.