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The culprit lied in rust-lang/rust#116505 In short, with default features turned off, main was trivial enough to be marked as inline function automatically which then made the symbol weak. Since nobody was referencing it, it got stripped away. Marking main in default-features=false config as #[inline(never)] or replacing 1 + 1 in it's body with a simple println!("foo") call (to make the main function sophisticated enough not to be subject to the new automatic marking as inline) makes the test pass again.
This was referenced Jan 20, 2024
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The culprit lied in rust-lang/rust#116505
In short, with default features turned off, main was trivial enough to
be marked as inline function automatically which then made the symbol
weak. Since nobody was referencing it, it got stripped away.
Marking main in default-features=false config as #[inline(never)] or
replacing 1 + 1 in it's body with a simple println!("foo") call (to make
the main function sophisticated enough not to be subject to the new
automatic marking as inline) makes the test pass again.