Copy-paste fix pattern
library CB-Math
fn main() {
u256 shift = CB-Math.clamp(requested_shift, 0, 255)
save one << shift
}Why it happens
A bit shift used a count outside the valid 0..255 range.
How to fix it
Clamp or validate the shift count before shifting.
Runtime and Studio now show this kind of page from the error dialog: plain message first, stable code second, original details third.