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If a module uses a class, then it can instantiate the class and thereby use its default methods, so we must include the default methods when calculating the fingerprint for the class. Test Plan: New unit test: driver/T15970 Before: ``` =====> T15970(normal) 1 of 1 [0, 0, 0] cd "T15970.run" && $MAKE -s --no-print-directory T15970 Wrong exit code for T15970()(expected 0 , actual 2 ) Stdout ( T15970 ): Makefile:13: recipe for target 'T15970' failed Stderr ( T15970 ): C.o:function Main_zdfTypeClassMyDataType1_info: error: undefined reference to 'A_toTypedData2_closure' C.o:function Main_main1_info: error: undefined reference to 'A_toTypedData2_closure' C.o(.data+0x298): error: undefined reference to 'A_toTypedData2_closure' C.o(.data+0x480): error: undefined reference to 'A_toTypedData2_closure' collect2: error: ld returned 1 exit status `gcc' failed in phase `Linker'. (Exit code: 1) ``` After: test passes. Reviewers: bgamari, simonpj, erikd, watashi, afarmer Subscribers: rwbarton, carter GHC Trac Issues: #15970 Differential Revision: https://phabricator.haskell.org/D5394
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