I think it would be wise to make the standard Rust mangling scheme(s), whatever they end up being, intentionally incompatible with the standard C++ mangling scheme(s) used on the same target. This is because, if you have C++ and Rust components linked into the same program, the linker should not resolve a call to extern void foo(int, int) as targeting pub fn foo(i32, i32) -> () unless the author of the latter specifically declared it pub extern "C++".
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