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This patch implements the `reconstruct` pattern for the `Path` hierarchy and its constituents (segments, generic args, qualified paths). Previously, derive expansion macros (like `derive(PartialEq)`) had to manually rebuild paths field-by-field to ensure fresh NodeIDs. This change moves that logic into the AST classes themselves, allowing paths to be deeply reconstructed uniformly. This ensures that expanded code has unique NodeIDs, which is critical for correct name resolution. gcc/rust/ChangeLog: * ast/rust-path.h (GenericArgsBinding::reconstruct): New method. (GenericArg::reconstruct): New method. (GenericArgs::reconstruct): New method. (PathExprSegment::reconstruct): New method. (PathInExpression::reconstruct): New method. (TypePathSegmentGeneric::reconstruct_impl): New method. (TypePathFunction::reconstruct): New method. (TypePathSegmentFunction::reconstruct_impl): New method. (QualifiedPathType::reconstruct): New method. (QualifiedPathInExpression::reconstruct): New method. (QualifiedPathInType::reconstruct_impl): New method. * expand/rust-derive-cmp-common.cc (EnumMatchBuilder::tuple): Use path.reconstruct(). (EnumMatchBuilder::strukt): Use path.reconstruct(). Signed-off-by: Jayant Chauhan <0001jayant@gmail.com>
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