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Suppress suggestions in derive macro close #118809 I suppress warnings inside derive macros. For example, the compiler emits following error by a program described in https://github.com/rust-lang/rust/issues/118809#issuecomment-1852256687 with a suggestion that indicates invalid syntax. ``` error[E0308]: `?` operator has incompatible types --> src/main.rs:3:17 | 3 | #[derive(Debug, Deserialize)] | ^^^^^^^^^^^ expected `u32`, found `u64` | = note: `?` operator cannot convert from `u64` to `u32` = note: this error originates in the derive macro `Deserialize` (in Nightly builds, run with -Z macro-backtrace for more info) help: you can convert a `u64` to a `u32` and panic if the converted value doesn't fit | 3 | #[derive(Debug, Deserialize.try_into().unwrap())] | ++++++++++++++++++++ For more information about this error, try `rustc --explain E0308`. error: could not compile `serde_test` (bin "serde_test") due to 2 previous errors ``` In this PR, suggestions to cast are suppressed. ``` error[E0308]: `?` operator has incompatible types --> src/main.rs:3:17 | 3 | #[derive(Debug, Deserialize)] | ^^^^^^^^^^^ expected `u32`, found `u64` | = note: `?` operator cannot convert from `u64` to `u32` = note: this error originates in the derive macro `Deserialize` (in Nightly builds, run with -Z macro-backtrace for more info) For more information about this error, try `rustc --explain E0308`. error: could not compile `serde_test` (bin "serde_test") due to 2 previous errors ```