[Issue 23136] New: closure in a loop should hold distinct values for each iteration

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23136

          Issue ID: 23136
           Summary: closure in a loop should hold distinct values for each
                    iteration
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: bugzilla at digitalmars.com

Reported by Timon Gehr.

This compiles even with -dip1000:

```d
import std.stdio;

void main()@safe{
    void delegate()@safe[] dgList;
    foreach(i; [1, 2, 3]) {
        immutable b = i;
        dgList ~= { writeln(b); };
    }
    foreach(dg; dgList) dg();
}
```

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