Changing the sublice does not change the original slice

[Turalchik]

func TestSlice(t *testing.T) {
	src := `package foo
	func Main() byte {
		a := make([]byte, 2)
		b := a[:1]
		b[0] = 42
		return a[0]
	}
	`
	eval(t, src, big.NewInt(42))
}

Current Behavior

Test returns 0.

Expected Behavior

Test should return 42.

Possible Solution

Perhaps you don't need to create a copy of the original slice when creating a subslice.

Steps to Reproduce

Run the test above.

Your Environment

v0.112.0

[roman-khimov]

We can emulate subslices efficiently with buffers for known at compile time offsets ([:1], it's just a matter of tracking additional data for variables to emit code properly. But dynamic slicing ([:x]) is a problem requiring additional data, can be emulated with a structure, but this incurs significant performance penalty.