[Issue 5305] intrinsic functions have @safe stripped of them in release mode.

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=5305

--- Comment #4 from Walter Bright <bugzilla at digitalmars.com> ---
Works with the current version of DMD. Adding a test case:

https://github.com/dlang/dmd/pull/5845

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