[Issue 12808] Small amount of escape analysis to allow more @nogc functions

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=12808

Stanislav Blinov <stanislav.blinov at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |stanislav.blinov at gmail.com

--- Comment #1 from Stanislav Blinov <stanislav.blinov at gmail.com> ---
Rewritten relevant parts into contemprary D. With dmd 2.098:

void program2() @nogc {
    foreach (x; [1, 2]) {}
}

import std.array : staticArray;

void program3() @nogc {
    import std.algorithm: filter;
    foreach (x; [1, 2].filter!(x => true)) {} // fails to infer @nogc
    // workaround:
    foreach (x; [1, 2].staticArray[].filter!(x => true)) {}
}

int[] program5() @nogc {
    return [1, 2].staticArray; // detects the escape correctly
}
void main() {}

So I guess the only outstanding enhancement here is to make this infer @nogc:

foreach (x; [1, 2].filter!(x => true)) {}

...if at all possible. If not, I guess this could be closed?

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