gccrs: add ellipsis inclusive range patterns lint - #4633
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Lower the ellipsis syntax flag onto the HIR range pattern so that the deprecated `...` form can be distinguished from `..=`, then warn on it in the unused checker. gcc/rust/ChangeLog: * hir/rust-ast-lower-pattern.cc (ASTLoweringPattern::visit): Propagate the ellipsis syntax flag onto the lowered range pattern. * checks/lints/unused/rust-unused-checker.cc (UnusedChecker::visit): New. * checks/lints/unused/rust-unused-checker.h (UnusedChecker::visit): New. gcc/testsuite/ChangeLog: * rust/compile/ellipsis-inclusive-range-patterns_0.rs: New test. Signed-off-by: Lucas Ly Ba <lucas.ly-ba@outlook.com>
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This patch adds the ellipsis inclusive range patterns lint, which warns on the deprecated
...range pattern syntax and suggests using..=instead.It also propagates the ellipsis syntax flag when lowering range patterns to HIR, so the deprecated
...form can be distinguished from..=.gcc/testsuite/ChangeLog: