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from a1a5cc0d044 /cp 2019-10-09 Paolo Carlini paolo.carlini@oracle.com new 9ba0a8ee7f1 Update the concepts implementation to conform to C++20.
The 1 revisions listed above as "new" are entirely new to this repository and will be described in separate emails. The revisions listed as "adds" were already present in the repository and have only been added to this reference.
Summary of changes: gcc/ChangeLog | 4 + gcc/c-family/ChangeLog | 14 + gcc/c-family/c-cppbuiltin.c | 8 +- gcc/c-family/c-opts.c | 11 + gcc/c-family/c.opt | 4 + gcc/cp/ChangeLog | 458 +++ gcc/cp/call.c | 54 +- gcc/cp/class.c | 3 + gcc/cp/config-lang.in | 1 + gcc/cp/constexpr.c | 22 +- gcc/cp/constraint.cc | 3769 ++++++++++---------- gcc/cp/cp-objcp-common.c | 9 +- gcc/cp/cp-tree.def | 72 +- gcc/cp/cp-tree.h | 358 +- gcc/cp/cxx-pretty-print.c | 197 +- gcc/cp/decl.c | 172 +- gcc/cp/error.c | 202 +- gcc/cp/lambda.c | 4 +- gcc/cp/logic.cc | 1183 +++--- gcc/cp/name-lookup.c | 11 +- gcc/cp/parser.c | 951 +++-- gcc/cp/pt.c | 956 +++-- gcc/cp/search.c | 5 +- gcc/cp/semantics.c | 55 +- gcc/cp/typeck.c | 3 +- gcc/cp/typeck2.c | 5 +- gcc/doc/invoke.texi | 17 +- gcc/testsuite/ChangeLog | 5 + gcc/testsuite/g++.dg/concepts/alias1.C | 16 - gcc/testsuite/g++.dg/concepts/alias2.C | 14 - gcc/testsuite/g++.dg/concepts/alias3.C | 14 - gcc/testsuite/g++.dg/concepts/alias4.C | 20 - gcc/testsuite/g++.dg/concepts/auto1.C | 2 +- gcc/testsuite/g++.dg/concepts/auto3.C | 2 +- gcc/testsuite/g++.dg/concepts/auto4.C | 4 +- gcc/testsuite/g++.dg/concepts/class-deduction1.C | 2 +- gcc/testsuite/g++.dg/concepts/class.C | 53 - gcc/testsuite/g++.dg/concepts/class1.C | 15 - gcc/testsuite/g++.dg/concepts/class2.C | 15 - gcc/testsuite/g++.dg/concepts/class3.C | 15 - gcc/testsuite/g++.dg/concepts/class4.C | 22 - gcc/testsuite/g++.dg/concepts/class5.C | 2 +- gcc/testsuite/g++.dg/concepts/class6.C | 4 +- gcc/testsuite/g++.dg/concepts/debug1.C | 8 +- gcc/testsuite/g++.dg/concepts/decl-diagnose.C | 8 +- .../g++.dg/concepts/deduction-constraint1.C | 2 +- gcc/testsuite/g++.dg/concepts/diagnostic1.C | 12 +- gcc/testsuite/g++.dg/concepts/disjunction1.C | 60 - gcc/testsuite/g++.dg/concepts/dr1430.C | 9 +- gcc/testsuite/g++.dg/concepts/equiv.C | 2 +- gcc/testsuite/g++.dg/concepts/equiv2.C | 12 +- gcc/testsuite/g++.dg/concepts/explicit-inst4.C | 18 - gcc/testsuite/g++.dg/concepts/explicit-spec3.C | 14 - gcc/testsuite/g++.dg/concepts/expression.C | 12 +- gcc/testsuite/g++.dg/concepts/expression2.C | 12 +- gcc/testsuite/g++.dg/concepts/expression3.C | 2 +- gcc/testsuite/g++.dg/concepts/feature-macro.C | 6 - gcc/testsuite/g++.dg/concepts/fn-concept1.C | 2 +- gcc/testsuite/g++.dg/concepts/fn-concept2.C | 2 +- .../g++.dg/concepts/fn-generic-member-ool.C | 1 - gcc/testsuite/g++.dg/concepts/fn1.C | 2 +- gcc/testsuite/g++.dg/concepts/fn10.C | 4 +- gcc/testsuite/g++.dg/concepts/fn2.C | 2 +- gcc/testsuite/g++.dg/concepts/fn3.C | 2 +- gcc/testsuite/g++.dg/concepts/fn4.C | 2 +- gcc/testsuite/g++.dg/concepts/fn5.C | 2 +- gcc/testsuite/g++.dg/concepts/fn6.C | 2 +- gcc/testsuite/g++.dg/concepts/fn7.C | 4 +- gcc/testsuite/g++.dg/concepts/fn8.C | 2 +- gcc/testsuite/g++.dg/concepts/fn9.C | 2 +- gcc/testsuite/g++.dg/concepts/generic-fn-err.C | 8 +- gcc/testsuite/g++.dg/concepts/generic-fn.C | 2 +- gcc/testsuite/g++.dg/concepts/iconv1.C | 21 - gcc/testsuite/g++.dg/concepts/inherit-ctor1.C | 28 +- gcc/testsuite/g++.dg/concepts/inherit-ctor3.C | 9 +- gcc/testsuite/g++.dg/concepts/inherit-ctor4.C | 19 - gcc/testsuite/g++.dg/concepts/intro1.C | 2 +- gcc/testsuite/g++.dg/concepts/intro2.C | 2 +- gcc/testsuite/g++.dg/concepts/intro3.C | 2 +- gcc/testsuite/g++.dg/concepts/intro4.C | 12 +- gcc/testsuite/g++.dg/concepts/intro5.C | 9 +- gcc/testsuite/g++.dg/concepts/intro6.C | 2 +- gcc/testsuite/g++.dg/concepts/intro7.C | 6 +- gcc/testsuite/g++.dg/concepts/locations1.C | 4 +- gcc/testsuite/g++.dg/concepts/memtmpl1.C | 16 - .../g++.dg/concepts/partial-concept-id1.C | 33 +- .../g++.dg/concepts/partial-concept-id2.C | 2 +- gcc/testsuite/g++.dg/concepts/partial-spec5.C | 2 +- gcc/testsuite/g++.dg/concepts/placeholder1.C | 35 - gcc/testsuite/g++.dg/concepts/placeholder2.C | 23 +- gcc/testsuite/g++.dg/concepts/placeholder3.C | 6 +- gcc/testsuite/g++.dg/concepts/placeholder4.C | 6 +- gcc/testsuite/g++.dg/concepts/placeholder5.C | 8 +- gcc/testsuite/g++.dg/concepts/placeholder6.C | 7 +- gcc/testsuite/g++.dg/concepts/pr65634.C | 2 +- gcc/testsuite/g++.dg/concepts/pr65636.C | 2 +- gcc/testsuite/g++.dg/concepts/pr65681.C | 65 +- gcc/testsuite/g++.dg/concepts/pr65848.C | 2 +- gcc/testsuite/g++.dg/concepts/pr67249.C | 2 +- gcc/testsuite/g++.dg/concepts/pr67544.C | 3 +- gcc/testsuite/g++.dg/concepts/pr67595.C | 8 +- gcc/testsuite/g++.dg/concepts/pr67655.C | 2 +- gcc/testsuite/g++.dg/concepts/pr68434.C | 2 +- gcc/testsuite/g++.dg/concepts/pr71127.C | 7 +- gcc/testsuite/g++.dg/concepts/pr71128.C | 4 +- gcc/testsuite/g++.dg/concepts/pr71131.C | 7 +- gcc/testsuite/g++.dg/concepts/pr71385.C | 2 +- gcc/testsuite/g++.dg/concepts/pr84330.C | 7 +- gcc/testsuite/g++.dg/concepts/pr85065.C | 6 +- gcc/testsuite/g++.dg/concepts/req-neg1.C | 11 - gcc/testsuite/g++.dg/concepts/req1.C | 29 - gcc/testsuite/g++.dg/concepts/req10.C | 19 - gcc/testsuite/g++.dg/concepts/req11.C | 29 - gcc/testsuite/g++.dg/concepts/req12.C | 26 - gcc/testsuite/g++.dg/concepts/req13.C | 14 - gcc/testsuite/g++.dg/concepts/req16.C | 20 - gcc/testsuite/g++.dg/concepts/req18.C | 18 - gcc/testsuite/g++.dg/concepts/req19.C | 14 - gcc/testsuite/g++.dg/concepts/req2.C | 20 - gcc/testsuite/g++.dg/concepts/req20.C | 21 - gcc/testsuite/g++.dg/concepts/req3.C | 17 - gcc/testsuite/g++.dg/concepts/req4.C | 19 - gcc/testsuite/g++.dg/concepts/req5.C | 19 - gcc/testsuite/g++.dg/concepts/req6.C | 19 - gcc/testsuite/g++.dg/concepts/req7.C | 25 - gcc/testsuite/g++.dg/concepts/req8.C | 17 - gcc/testsuite/g++.dg/concepts/req9.C | 25 - gcc/testsuite/g++.dg/concepts/template-parm1.C | 35 - gcc/testsuite/g++.dg/concepts/template-parm10.C | 18 - gcc/testsuite/g++.dg/concepts/template-parm11.C | 2 +- gcc/testsuite/g++.dg/concepts/template-parm12.C | 4 +- gcc/testsuite/g++.dg/concepts/template-parm2.C | 2 +- gcc/testsuite/g++.dg/concepts/template-parm3.C | 2 +- gcc/testsuite/g++.dg/concepts/template-parm4.C | 2 +- gcc/testsuite/g++.dg/concepts/template-parm5.C | 20 - gcc/testsuite/g++.dg/concepts/template-parm6.C | 42 - gcc/testsuite/g++.dg/concepts/template-parm7.C | 45 - gcc/testsuite/g++.dg/concepts/template-parm9.C | 19 - .../g++.dg/concepts/template-template-parm1.C | 2 +- gcc/testsuite/g++.dg/concepts/var-concept1.C | 2 +- gcc/testsuite/g++.dg/concepts/var-concept2.C | 2 +- gcc/testsuite/g++.dg/concepts/var-concept3.C | 15 +- gcc/testsuite/g++.dg/concepts/var-concept4.C | 2 +- gcc/testsuite/g++.dg/concepts/var-concept5.C | 6 +- gcc/testsuite/g++.dg/concepts/var-concept6.C | 2 +- gcc/testsuite/g++.dg/concepts/var-concept7.C | 4 +- gcc/testsuite/g++.dg/concepts/var-templ1.C | 2 +- gcc/testsuite/g++.dg/concepts/var-templ2.C | 2 +- gcc/testsuite/g++.dg/concepts/var-templ3.C | 2 +- gcc/testsuite/g++.dg/concepts/variadic1.C | 2 +- gcc/testsuite/g++.dg/concepts/variadic2.C | 9 +- gcc/testsuite/g++.dg/concepts/variadic3.C | 2 +- gcc/testsuite/g++.dg/concepts/variadic4.C | 11 +- gcc/testsuite/g++.dg/cpp0x/auto52.C | 2 +- gcc/testsuite/g++.dg/cpp0x/lambda/lambda-err2.C | 2 +- gcc/testsuite/g++.dg/cpp2a/concepts-access1.C | 15 + gcc/testsuite/g++.dg/cpp2a/concepts-alias.C | 25 + gcc/testsuite/g++.dg/cpp2a/concepts-alias2.C | 12 + gcc/testsuite/g++.dg/cpp2a/concepts-class.C | 115 + gcc/testsuite/g++.dg/cpp2a/concepts-cmath.C | 4 + gcc/testsuite/g++.dg/cpp2a/concepts-complete1.C | 11 + .../concepts-constrained-parm.C} | 5 +- gcc/testsuite/g++.dg/cpp2a/concepts-decltype.C | 67 + gcc/testsuite/g++.dg/cpp2a/concepts-defarg1.C | 7 + gcc/testsuite/g++.dg/cpp2a/concepts-dep1.C | 5 + gcc/testsuite/g++.dg/cpp2a/concepts-dr1430.C | 14 + .../concepts-explicit-inst1.C} | 11 +- .../concepts-explicit-inst2.C} | 7 +- .../concepts-explicit-inst3.C} | 13 +- .../g++.dg/cpp2a/concepts-explicit-inst4.C | 17 + .../concepts-explicit-spec1.C} | 7 +- .../concepts-explicit-spec2.C} | 5 +- .../g++.dg/cpp2a/concepts-explicit-spec3.C | 13 + .../concepts-explicit-spec4.C} | 13 +- .../concepts-explicit-spec5.C} | 9 +- .../concepts-explicit-spec6.C} | 3 +- .../g++.dg/cpp2a/concepts-feature-macro.C | 5 + gcc/testsuite/g++.dg/cpp2a/concepts-fn1.C | 248 ++ .../{concepts/memfun.C => cpp2a/concepts-fn2.C} | 49 +- gcc/testsuite/g++.dg/cpp2a/concepts-fn3.C | 49 + gcc/testsuite/g++.dg/cpp2a/concepts-fnparm1.C | 10 + .../friend1.C => cpp2a/concepts-friend1.C} | 7 +- .../friend2.C => cpp2a/concepts-friend2.C} | 5 +- gcc/testsuite/g++.dg/cpp2a/concepts-friend3.C | 20 + gcc/testsuite/g++.dg/cpp2a/concepts-iconv1.C | 22 + .../concepts-inherit-ctor2.C} | 7 +- .../g++.dg/cpp2a/concepts-inherit-ctor4.C | 18 + .../g++.dg/cpp2a/concepts-inherit-ctor5.C | 18 + .../lambda1.C => cpp2a/concepts-lambda1.C} | 15 +- .../locations1.C => cpp2a/concepts-locations1.C} | 10 +- .../g++.dg/cpp2a/concepts-member-concept.C | 21 + .../memfun-err.C => cpp2a/concepts-memfun-err.C} | 16 +- .../{concepts/memfun.C => cpp2a/concepts-memfun.C} | 45 +- gcc/testsuite/g++.dg/cpp2a/concepts-memtmpl1.C | 17 + gcc/testsuite/g++.dg/cpp2a/concepts-memtmpl2.C | 15 + gcc/testsuite/g++.dg/cpp2a/concepts-nested1.C | 13 + gcc/testsuite/g++.dg/cpp2a/concepts-noexcept1.C | 25 + gcc/testsuite/g++.dg/cpp2a/concepts-p1141.C | 98 + .../concepts-partial-spec.C} | 2 +- .../concepts-partial-spec2.C} | 15 +- .../concepts-partial-spec3.C} | 2 +- .../concepts-partial-spec4.C} | 5 +- .../g++.dg/cpp2a/concepts-partial-spec5.C | 12 + .../concepts-partial-spec6.C} | 7 +- gcc/testsuite/g++.dg/cpp2a/concepts-placeholder1.C | 14 + .../pr58500.C => cpp2a/concepts-pr58500.C} | 0 .../pr58534.C => cpp2a/concepts-pr58534.C} | 0 .../pr58535.C => cpp2a/concepts-pr58535.C} | 0 .../pr58536.C => cpp2a/concepts-pr58536.C} | 0 .../pr58548.C => cpp2a/concepts-pr58548.C} | 0 .../pr58549.C => cpp2a/concepts-pr58549.C} | 0 .../alias-decl-42.C => cpp2a/concepts-pr59200.C} | 3 +- .../pr60052.C => cpp2a/concepts-pr60052.C} | 0 .../pr60053.C => cpp2a/concepts-pr60053.C} | 0 .../pr60064.C => cpp2a/concepts-pr60064.C} | 0 .../pr60065.C => cpp2a/concepts-pr60065.C} | 0 .../pr60377.C => cpp2a/concepts-pr60377.C} | 0 .../pr60390.C => cpp2a/concepts-pr60390.C} | 0 .../pr60391.C => cpp2a/concepts-pr60391.C} | 0 .../pr60573.C => cpp2a/concepts-pr60573.C} | 0 .../pr65552.C => cpp2a/concepts-pr65552.C} | 8 +- .../pr65575.C => cpp2a/concepts-pr65575.C} | 11 +- gcc/testsuite/g++.dg/cpp2a/concepts-pr65634.C | 18 + gcc/testsuite/g++.dg/cpp2a/concepts-pr65636.C | 8 + gcc/testsuite/g++.dg/cpp2a/concepts-pr65848.C | 59 + .../pr65854.C => cpp2a/concepts-pr65854.C} | 11 +- .../pr66091.C => cpp2a/concepts-pr66091.C} | 5 +- gcc/testsuite/g++.dg/cpp2a/concepts-pr66844.C | 16 + gcc/testsuite/g++.dg/cpp2a/concepts-pr66962.C | 80 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67070.C | 51 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67147.C | 25 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67148.C | 121 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67178.C | 26 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67210.C | 10 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67217.C | 8 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67225-1.C | 32 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67225-2.C | 36 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67225-3.C | 21 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67225-4.C | 14 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67225-5.C | 17 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67319.C | 24 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67427.C | 22 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67654.C | 30 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67658.C | 14 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67684.C | 63 + .../pr58500.C => cpp2a/concepts-pr67685.C} | 6 +- gcc/testsuite/g++.dg/cpp2a/concepts-pr67692.C | 13 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67697.C | 15 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67719.C | 15 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67774.C | 26 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67825.C | 20 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67860.C | 61 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67862.C | 162 + gcc/testsuite/g++.dg/cpp2a/concepts-pr67969.C | 32 + gcc/testsuite/g++.dg/cpp2a/concepts-pr68093-1.C | 13 + gcc/testsuite/g++.dg/cpp2a/concepts-pr68093-2.C | 14 + gcc/testsuite/g++.dg/cpp2a/concepts-pr68372.C | 48 + gcc/testsuite/g++.dg/cpp2a/concepts-pr68434.C | 18 + .../pr68683.C => cpp2a/concepts-pr68683.C} | 8 +- gcc/testsuite/g++.dg/cpp2a/concepts-pr68812.C | 34 + gcc/testsuite/g++.dg/cpp2a/concepts-pr69235.C | 48 + .../pr71368.C => cpp2a/concepts-pr71368.C} | 12 +- gcc/testsuite/g++.dg/cpp2a/concepts-pr71385.C | 14 + .../pr71965.C => cpp2a/concepts-pr71965.C} | 11 +- .../memfun2.C => cpp2a/concepts-pr72415.C} | 2 +- gcc/testsuite/g++.dg/cpp2a/concepts-pr78752.C | 18 + gcc/testsuite/g++.dg/cpp2a/concepts-pr79759.C | 7 + .../pr80471.C => cpp2a/concepts-pr80471.C} | 0 gcc/testsuite/g++.dg/cpp2a/concepts-pr80746.C | 14 + gcc/testsuite/g++.dg/cpp2a/concepts-pr80773.C | 33 + gcc/testsuite/g++.dg/cpp2a/concepts-pr82507.C | 17 + gcc/testsuite/g++.dg/cpp2a/concepts-pr82740.C | 32 + gcc/testsuite/g++.dg/cpp2a/concepts-pr84140.C | 38 + gcc/testsuite/g++.dg/cpp2a/concepts-pr84551.C | 11 + .../pr84979-2.C => cpp2a/concepts-pr84979-2.C} | 0 .../pr84979-3.C => cpp2a/concepts-pr84979-3.C} | 0 .../pr84979.C => cpp2a/concepts-pr84979.C} | 0 .../pr84980.C => cpp2a/concepts-pr84980.C} | 4 +- .../pr85265.C => cpp2a/concepts-pr85265.C} | 3 +- .../concepts-pr85706.C} | 0 gcc/testsuite/g++.dg/cpp2a/concepts-pr85808.C | 19 + gcc/testsuite/g++.dg/cpp2a/concepts-pr86269.C | 19 + gcc/testsuite/g++.dg/cpp2a/concepts-pr87441.C | 10 + gcc/testsuite/g++.dg/cpp2a/concepts-requires1.C | 71 + gcc/testsuite/g++.dg/cpp2a/concepts-requires10.C | 32 + .../req17.C => cpp2a/concepts-requires11.C} | 10 +- gcc/testsuite/g++.dg/cpp2a/concepts-requires12.C | 21 + gcc/testsuite/g++.dg/cpp2a/concepts-requires13.C | 20 + gcc/testsuite/g++.dg/cpp2a/concepts-requires14.C | 24 + gcc/testsuite/g++.dg/cpp2a/concepts-requires15.C | 15 + gcc/testsuite/g++.dg/cpp2a/concepts-requires16.C | 47 + gcc/testsuite/g++.dg/cpp2a/concepts-requires17.C | 11 + gcc/testsuite/g++.dg/cpp2a/concepts-requires2.C | 74 + gcc/testsuite/g++.dg/cpp2a/concepts-requires3.C | 32 + gcc/testsuite/g++.dg/cpp2a/concepts-requires4.C | 15 + gcc/testsuite/g++.dg/cpp2a/concepts-requires5.C | 45 + gcc/testsuite/g++.dg/cpp2a/concepts-requires6.C | 34 + .../req14.C => cpp2a/concepts-requires7.C} | 9 +- gcc/testsuite/g++.dg/cpp2a/concepts-requires8.C | 17 + .../req15.C => cpp2a/concepts-requires9.C} | 3 +- gcc/testsuite/g++.dg/cpp2a/concepts-sfinae1.C | 10 + .../g++.dg/cpp2a/concepts-template-parm1.C | 19 + .../g++.dg/cpp2a/concepts-template-parm10.C | 10 + .../g++.dg/cpp2a/concepts-template-parm2.C | 15 + .../g++.dg/cpp2a/concepts-template-parm5.C | 9 + .../g++.dg/cpp2a/concepts-template-parm6.C | 44 + .../concepts-template-parm8.C} | 11 +- .../g++.dg/cpp2a/concepts-template-parm9.C | 18 + .../traits1.C => cpp2a/concepts-traits1.C} | 41 +- .../traits2.C => cpp2a/concepts-traits2.C} | 41 +- gcc/testsuite/g++.dg/cpp2a/concepts-ts1.C | 49 + gcc/testsuite/g++.dg/cpp2a/concepts-ts2.C | 260 ++ gcc/testsuite/g++.dg/cpp2a/concepts-ts3.C | 251 ++ gcc/testsuite/g++.dg/cpp2a/concepts-ts4.C | 34 + .../member-concept.C => cpp2a/concepts-ts5.C} | 4 +- gcc/testsuite/g++.dg/cpp2a/concepts-ts6.C | 72 + gcc/testsuite/g++.dg/cpp2a/concepts-using1.C | 17 + gcc/testsuite/g++.dg/cpp2a/concepts.C | 57 + gcc/testsuite/g++.dg/cpp2a/concepts1.C | 27 + gcc/testsuite/g++.dg/cpp2a/concepts2.C | 69 + gcc/testsuite/g++.dg/cpp2a/concepts3.C | 48 + gcc/testsuite/g++.dg/cpp2a/concepts4.C | 10 + gcc/testsuite/g++.dg/cpp2a/cond-triv2.C | 30 + gcc/testsuite/lib/g++-dg.exp | 2 +- gcc/testsuite/lib/target-supports.exp | 2 +- gcc/timevar.def | 5 +- 326 files changed, 9444 insertions(+), 4855 deletions(-) delete mode 100644 gcc/testsuite/g++.dg/concepts/alias1.C delete mode 100644 gcc/testsuite/g++.dg/concepts/alias2.C delete mode 100644 gcc/testsuite/g++.dg/concepts/alias3.C delete mode 100644 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