fn shiftLeftSat(r: *Managed, a: *const Managed, shift: usize, signedness: Signedness, bit_count: usize) !void

r = a <<| shift with 2s-complement saturating semantics. r and a may alias.

Parameters

r: *Managed,
a: *const Managed,
shift: usize,
signedness: Signedness,
bit_count: usize,