Resolve and lower parenthesized types #3328
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This is useful for handling multiple trait bounds, and required for better handling of auto traits. gcc/rust/ChangeLog: * hir/rust-ast-lower-type.cc (ASTLoweringType::visit): Add implementation for ParenthesizedType. * hir/rust-ast-lower-type.h: Declare that new visitor. gcc/testsuite/ChangeLog: * rust/compile/auto_traits1.rs: New test.
This commit correctly lowers and typechecks parenthesized types, which are used for trait objects with additional bounds. gcc/rust/ChangeLog: * resolve/rust-ast-resolve-type.cc (ResolveType::visit): New visitor to handle ParenthesizedType. * resolve/rust-ast-resolve-type.h: Likewise. * typecheck/rust-hir-type-check-type.cc (TypeCheckType::visit): Likewise. * typecheck/rust-hir-type-check-type.h: Likewise. gcc/testsuite/ChangeLog: * rust/compile/auto_traits2.rs: New test. * rust/compile/auto_traits3.rs: New test.
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Needs #3324
This allows us to start looking at more handling for auto traits and multiple trait bounds, as they are always represented as parenthesized types when used in function parameters