[Issue 19984] Support shared in foreach lambdas

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19984

--- Comment #5 from anonymous4 <dfj1esp02 at sneakemail.com> ---
Your example implicitly converts thread local data to shared:
---
struct S {
    int result;
    int[] data;
    void inc(int i) shared { result.atomic!"+="(i); }
}
shared int[] data;
int sum(){
    S s;
    s.data=[0,1,2];
    foreach(i; iota(1000).parallel){
        static assert(is(typeof(s) == shared(S)));
        s.inc(i);
        data=s.data;
    }
    static assert(is(typeof(s) == S));
    assert(s.data[0]==0,"now it's local and shared");
    return s.result;
}
---

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