On 06.07.19 01:12, Patrick Schluter wrote:
On Friday, 5 July 2019 at 23:08:04 UTC, Patrick Schluter wrote:
On Thursday, 4 July 2019 at 10:56:50 UTC, Nick Treleaven wrote:
immutable(int[]) f() @nogc {
    return [1,2];

and it cannot optimize it away because it doesn't know what the caller want to do with it. It might in another module invoke it and modify it, the compiler cannot tell. auto a=f(); a[0]++;

f returns immutable. typeof(a) is immutable(int[]). You can't do a[0]++.

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