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Within the compiler, module keywords "import", "module", and "export" that are recognized as part of module directives gain an extra trailing space to distinguish them from other non-keyword uses of those words in the code. But when dumping preprocessed output, printing those spaces creates a gratuitous inconsistency with non-modules preprocessing, as revealed by several of the g++.dg/modules/cpp* tests if modules are enabled by default in C++20 mode. libcpp/ChangeLog: * lex.cc (cpp_output_token): Omit terminal space from name. gcc/testsuite/ChangeLog: * g++.dg/modules/cpp-2_c.C: Expect only one space after import. * g++.dg/modules/cpp-5_c.C * g++.dg/modules/dep-2.C * g++.dg/modules/dir-only-2_b.C * g++.dg/modules/pr99050_b.C * g++.dg/modules/inc-xlate-1_b.H * g++.dg/modules/legacy-3_b.H * g++.dg/modules/legacy-3_c.H: Likewise.