unary minus from array of function call while in brackets

[tsh73]

Found while translating program from other BASIC:
Can i make questions about BASIC (no Just BASIC) here?
justbasiccom.proboards.com/thread/638/make-basic

Bug exists in LB 4.5.1 and Just BASIC 1.01 as well

We know (by experience) that unary minus not supported in JB.

BUT:
Unary minus from array of function call while in brackets
- does not get flagged as error
- but does not work right (instead of calling function/returning array value, returns argument)

It is hard-to find error.
Like, "I know R(i) is 0. So (-R(i)*some other stuff) should be 0, is it?"


y(3)=123

i = 3
print y(i)  '123
print (0-y(i))  '-123
print (-y(i))   'expected error, got 3
'it doesn't actually access array (it would error out of 0..10
print (-y(654)) 'expected error, got 654
print (-y(-654)) 'expected error, got -654

'same thing about functions
print
print f(i)  'in function, x=3 // 3.01
print (0-f(i))  'in function, x=3 // -3.01
print (-f(i))   'expected error, got 3
'it doesn't actually access function - no message "in  function"
print (-f(654)) 'expected error, got 654, no message "in  function"

function f(x)
   print "in function, x=";x
   f=x+0.01
end function

Results:
123
-123
3
654
-654

in function, x=3
3.01
in function, x=3
-3.01
3
654