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This patch adds support for serializing and deserializing SPLICE_SCOPE trees in C++20 modules implementation. SPLICE_SCOPE is introduced by C++26 reflection, notably used for dependent splice types, thus needing to be exported/imported as part of the module interface. Not handling SPLICE_SCOPE leads to ICE. This patch also includes 2 simple test cases: one for exporting splice scope types and another for importing them. gcc/cp/ * module.cc (trees_out::type_node): Add case for SPLICE_SCOPE. (trees_in::tree_node): Add case for SPLICE_SCOPE. gcc/testsuite/ * g++.dg/modules/splice-scope-tree_a.C: New test. * g++.dg/modules/splice-scope-tree_b.C: New test. Reviewed-by: Patrick Palka <ppalka@redhat.com> Reviewed-by: Jason Merrill <jason@redhat.com>
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