Fix E0742: alloc_error_handler Must Be in Main Crate
Rust compiler error E0742 occurs when #[alloc_error_handler] is placed on a function outside the main crate, violating the requirement that allocator functions must be defined in the entry crate.
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Rust compiler error E0742 occurs when #[alloc_error_handler] is placed on a function outside the main crate, violating the requirement that allocator functions must be defined in the entry crate.
Comprehensive guide to resolving Rust compiler error E0378, which occurs when implementing the GlobalAlloc trait with incorrect method signatures, conflicting implementations, or insufficient trait coverage.