[Issue 19752] dip1000 isn't @safe if struct contains a slice

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19752

--- Comment #5 from Walter Bright <bugzilla at digitalmars.com> ---
The key to understanding perplexing examples is to ruthlessly rewrite them in
terms of `int*` and plain functions. Get rid of slices, this references,
structs, member functions, etc. which do nothing but obfuscate what is
happening, as they are just fancier versions of int* and functions.

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