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When -Z autodiff=Enable is used, the compiler automatically enables fat-lto for all crates. However, proc-macro crates cannot use fat-lto without the -Zdylib-lto flag, causing compilation errors. This commit modifies the lto() method in Session to exclude proc-macro crates from fat-lto when autodiff is enabled, while preserving the existing behavior for all other crate types. The fix ensures that: - Non-proc-macro crates still get fat-lto when autodiff is enabled - Proc-macro crates are excluded from fat-lto when autodiff is enabled - Existing autodiff functionality remains unchanged for regular crates Signed-off-by: Osama Abdelkader <osama.abdelkader@gmail.com>