peer type resolution for *@Frame(func), anyframe->T, and anyframe

[andrewrk]

const std = @import("std");
const expect = std.testing.expect;

test "peer type resolution of *@Frame(func) and anyframe->T and anyframe" {
    var f2_frame = async f2();

    var x: @Frame(func) = async func();
    var y: anyframe->i32 = &f2_frame;
    var z: anyframe = &x;

    var runtime: i8 = 1;
    var result = switch (runtime) {
        0 => &x,
        1 => y,
        else => z,
    };
    comptime expect(@typeOf(result) == anyframe);
    expect(result == y);

    var result2 = switch (runtime) {
        0 => &x,
        else => z,
    };
    comptime expect(@typeOf(result2) == anyframe);
    expect(result2 == z);

    var result3 = switch (runtime) {
        0 => &x,
        else => y,
    };
    comptime expect(@typeOf(result3) == anyframe->i32);
    expect(result3 == y);
}

fn func() i32 {
    return 1234;
}
fn f2() i32 {
    return 4;
}