Looks like “Bad number” is a different kind of error than other
syntax errors. If, say, lone ¯ is evaluated in ⎕EC¨ last then
it seems to abort the whole line ⎕EC¨ appears in.
I'm at r712.
⎕EC¨'1¯' ⍝ no result at all
⎕FX'f x' '⊣ ⎕EC¨x'
f
f'1¯' ⍝ unexpected output
1 0 0 1 0 2 2 SYNTAX ERROR
When it comes first, the interpreter does a double free somewhere
and gets aborted:
⎕EC¨'¯1'
*** Error in `/usr/bin/apl': free(): invalid pointer: 0x00007ffd734c2b50 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x71ff5)[0x7f968e09cff5]
/lib/x86_64-linux-gnu/libc.so.6(+0x77946)[0x7f968e0a2946]
/lib/x86_64-linux-gnu/libc.so.6(+0x7812e)[0x7f968e0a312e]
/usr/bin/apl(_ZN14Bif_OPER1_EACH14finish_eval_LBER7EOC_arg+0x33c)[0x464c9c]
/usr/bin/apl(_ZN14Bif_OPER1_EACH7eval_LBER5Token7Value_P+0x197)[0x4658e7]
/usr/bin/apl(_ZN15DerivedFunction6eval_BE7Value_P+0x257)[0x49fc77]
/usr/bin/apl(_ZN6Prefix16reduce_MISC_F_B_Ev+0x8e)[0x4cc54e]
/usr/bin/apl(_ZN6Prefix17reduce_statementsEv+0x228)[0x4cd268]
/usr/bin/apl(_ZN14StateIndicator3runEv+0x10)[0x526e90]
/usr/bin/apl(_ZNK10Executable12execute_bodyEv+0x15)[0x497a85]
/usr/bin/apl(_ZN7Command17do_APL_expressionER10UCS_string+0x5a)[0x48cbda]
/usr/bin/apl(_ZN7Command12process_lineEv+0xba)[0x48cb1a]
/usr/bin/apl(_ZN9Workspace19immediate_executionEb+0x2d)[0x57b8bd]
/usr/bin/apl(main+0x25)[0x444195]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f968e04b610]
/usr/bin/apl(_start+0x29)[0x448f99]
======= Memory map: ========
(...)
-k
