Discrepancy in (integer *= float); between LSL Mono and LSL Luau | Voters

Discrepancy in (integer *= float); between LSL Mono and LSL Luau

planned

SuzannaLinn Resident

I'm reporting this one because we are looking for all the differences, but I don't think that it has any real use.

// LSL Mono
default { state_entry() {
    integer a = 2;
    (a *= 2.2);
    llOwnerSay((string)a);  // --> 4
}}

// LSL Luau
default { state_entry() {
    integer a = 2;
    (a *= 2.2);  // --> Script run-time error : cannot take result of integer *= float
}}

a *= 2.2;

works in both,

float f = (a *= 2.2);

errors in both.

4 days ago

SuzannaLinn Resident

This is a different error around the same place.

Now without parentheses (that it would work) but with a global variable:

// LSL Luau
integer a = 2;
default { state_entry() {;
    a *= 2.2;  // --> Script run-time error: lsl_script:0: attempt to perform arithmetic (mul) on nil and number
}}

Harold Linden

marked this post as

planned

Harold Linden

Thanks for sending this in!
Ahhhh I see! Yep, we need to block all places where we take the result of int *= float
, but wrapping it in parens isn't really "taking the result".
I suspect we need to fix this in Tailslide, since that's where the LLExpression::getResultNeeded()
 that's used by SLua's LSL compiler lives. I imagine it's doing that calculation _before_ stripping out parens, and doesn't account for them.