gccrs: add trivial numeric casts lint#4629
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gcc/rust/ChangeLog: * checks/lints/unused/rust-unused-checker.cc (is_numeric): New. (UnusedChecker::visit): New. * checks/lints/unused/rust-unused-checker.h (UnusedChecker::visit): New. * rust-lang.cc (grs_langhook_init_options_struct): Enable warn_unused. gcc/testsuite/ChangeLog: * rust/compile/trivial-numeric-casts_0.rs: New test. Signed-off-by: Lucas Ly Ba <lucas.ly-ba@outlook.com>
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This patch adds the trivial numeric casts lint, which warns on a numeric cast where the source and target types are the same, e.g.
x as i32whenxis already ani32.gcc/testsuite/ChangeLog: