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Move UFCS to end of cpp2util.h
Seeing if this can make the known-error test cases less sensitive to future line number changes
1 parent dc3758a commit ebfb7bc

16 files changed

+249
-308
lines changed

Diff for: ‎include/cpp2util.h

+149-148
Large diffs are not rendered by default.

Diff for: ‎regression-tests/test-results/clang-12-c++20/mixed-bugfix-for-ufcs-non-local.cpp.output

+30-30
Original file line numberDiff line numberDiff line change
@@ -1,134 +1,134 @@
11
mixed-bugfix-for-ufcs-non-local.cpp2:13:12: error: a lambda expression cannot appear in this context
22
template<t<CPP2_UFCS_NONLOCAL(f)(o)> UnnamedTypeParam1_1> bool inline constexpr v0{ false };// Fails on GCC ([GCC109781][]) and Clang 12 (a lambda expression cannot appear in this context)
33
^
4-
../../../include/cpp2util.h:2137:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
4+
../../../include/cpp2util.h:10096:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
55
#define CPP2_UFCS_NONLOCAL(...) CPP2_UFCS_(,CPP2_UFCS_IDENTITY,CPP2_UFCS_IDENTITY,(),,__VA_ARGS__)
66
^
7-
../../../include/cpp2util.h:2099:66: note: expanded from macro 'CPP2_UFCS_'
7+
../../../include/cpp2util.h:10058:66: note: expanded from macro 'CPP2_UFCS_'
88
#define CPP2_UFCS_(LAMBDADEFCAPT,SFINAE,MVFWD,QUALID,TEMPKW,...) \
99
^
1010
mixed-bugfix-for-ufcs-non-local.cpp2:15:3: error: a lambda expression cannot appear in this context
1111
t<CPP2_UFCS_NONLOCAL(f)(o)> inline constexpr v1{ t<true>() };// Fails on Clang 12 (lambda in unevaluated context).
1212
^
13-
../../../include/cpp2util.h:2137:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
13+
../../../include/cpp2util.h:10096:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
1414
#define CPP2_UFCS_NONLOCAL(...) CPP2_UFCS_(,CPP2_UFCS_IDENTITY,CPP2_UFCS_IDENTITY,(),,__VA_ARGS__)
1515
^
16-
../../../include/cpp2util.h:2099:66: note: expanded from macro 'CPP2_UFCS_'
16+
../../../include/cpp2util.h:10058:66: note: expanded from macro 'CPP2_UFCS_'
1717
#define CPP2_UFCS_(LAMBDADEFCAPT,SFINAE,MVFWD,QUALID,TEMPKW,...) \
1818
^
1919
mixed-bugfix-for-ufcs-non-local.cpp2:21:12: error: a lambda expression cannot appear in this context
2020
template<t<CPP2_UFCS_NONLOCAL(f)(o)> UnnamedTypeParam1_2> auto g() -> void;
2121
^
22-
../../../include/cpp2util.h:2137:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
22+
../../../include/cpp2util.h:10096:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
2323
#define CPP2_UFCS_NONLOCAL(...) CPP2_UFCS_(,CPP2_UFCS_IDENTITY,CPP2_UFCS_IDENTITY,(),,__VA_ARGS__)
2424
^
25-
../../../include/cpp2util.h:2099:66: note: expanded from macro 'CPP2_UFCS_'
25+
../../../include/cpp2util.h:10058:66: note: expanded from macro 'CPP2_UFCS_'
2626
#define CPP2_UFCS_(LAMBDADEFCAPT,SFINAE,MVFWD,QUALID,TEMPKW,...) \
2727
^
2828
mixed-bugfix-for-ufcs-non-local.cpp2:23:42: error: a lambda expression cannot appear in this context
2929
auto g([[maybe_unused]] cpp2::impl::in<t<CPP2_UFCS_NONLOCAL(f)(o)>> unnamed_param_1) -> void;
3030
^
31-
../../../include/cpp2util.h:2137:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
31+
../../../include/cpp2util.h:10096:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
3232
#define CPP2_UFCS_NONLOCAL(...) CPP2_UFCS_(,CPP2_UFCS_IDENTITY,CPP2_UFCS_IDENTITY,(),,__VA_ARGS__)
3333
^
34-
../../../include/cpp2util.h:2099:66: note: expanded from macro 'CPP2_UFCS_'
34+
../../../include/cpp2util.h:10058:66: note: expanded from macro 'CPP2_UFCS_'
3535
#define CPP2_UFCS_(LAMBDADEFCAPT,SFINAE,MVFWD,QUALID,TEMPKW,...) \
3636
^
3737
mixed-bugfix-for-ufcs-non-local.cpp2:27:29: error: a lambda expression cannot appear in this context
3838
[[nodiscard]] auto h() -> t<CPP2_UFCS_NONLOCAL(f)(o)>;
3939
^
40-
../../../include/cpp2util.h:2137:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
40+
../../../include/cpp2util.h:10096:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
4141
#define CPP2_UFCS_NONLOCAL(...) CPP2_UFCS_(,CPP2_UFCS_IDENTITY,CPP2_UFCS_IDENTITY,(),,__VA_ARGS__)
4242
^
43-
../../../include/cpp2util.h:2099:66: note: expanded from macro 'CPP2_UFCS_'
43+
../../../include/cpp2util.h:10058:66: note: expanded from macro 'CPP2_UFCS_'
4444
#define CPP2_UFCS_(LAMBDADEFCAPT,SFINAE,MVFWD,QUALID,TEMPKW,...) \
4545
^
4646
mixed-bugfix-for-ufcs-non-local.cpp2:31:12: error: a lambda expression cannot appear in this context
4747
template<t<CPP2_UFCS_NONLOCAL(f)(o)> UnnamedTypeParam1_3> using a = bool;// Fails on GCC ([GCC109781][]) and Clang 12 (a lambda expression cannot appear in this context)
4848
^
49-
../../../include/cpp2util.h:2137:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
49+
../../../include/cpp2util.h:10096:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
5050
#define CPP2_UFCS_NONLOCAL(...) CPP2_UFCS_(,CPP2_UFCS_IDENTITY,CPP2_UFCS_IDENTITY,(),,__VA_ARGS__)
5151
^
52-
../../../include/cpp2util.h:2099:66: note: expanded from macro 'CPP2_UFCS_'
52+
../../../include/cpp2util.h:10058:66: note: expanded from macro 'CPP2_UFCS_'
5353
#define CPP2_UFCS_(LAMBDADEFCAPT,SFINAE,MVFWD,QUALID,TEMPKW,...) \
5454
^
5555
mixed-bugfix-for-ufcs-non-local.cpp2:33:12: error: a lambda expression cannot appear in this context
5656
template<t<CPP2_UFCS_NONLOCAL(f)(o)> UnnamedTypeParam1_4> auto inline constexpr b{ false };// Fails on GCC ([GCC109781][]).
5757
^
58-
../../../include/cpp2util.h:2137:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
58+
../../../include/cpp2util.h:10096:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
5959
#define CPP2_UFCS_NONLOCAL(...) CPP2_UFCS_(,CPP2_UFCS_IDENTITY,CPP2_UFCS_IDENTITY,(),,__VA_ARGS__)
6060
^
61-
../../../include/cpp2util.h:2099:66: note: expanded from macro 'CPP2_UFCS_'
61+
../../../include/cpp2util.h:10058:66: note: expanded from macro 'CPP2_UFCS_'
6262
#define CPP2_UFCS_(LAMBDADEFCAPT,SFINAE,MVFWD,QUALID,TEMPKW,...) \
6363
^
6464
mixed-bugfix-for-ufcs-non-local.cpp2:35:13: error: a lambda expression cannot appear in this context
6565
using c = t<CPP2_UFCS_NONLOCAL(f)(o)>;// Fails on Clang 12 (lambda in unevaluated context) and Clang 12 (a lambda expression cannot appear in this context)
6666
^
67-
../../../include/cpp2util.h:2137:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
67+
../../../include/cpp2util.h:10096:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
6868
#define CPP2_UFCS_NONLOCAL(...) CPP2_UFCS_(,CPP2_UFCS_IDENTITY,CPP2_UFCS_IDENTITY,(),,__VA_ARGS__)
6969
^
70-
../../../include/cpp2util.h:2099:66: note: expanded from macro 'CPP2_UFCS_'
70+
../../../include/cpp2util.h:10058:66: note: expanded from macro 'CPP2_UFCS_'
7171
#define CPP2_UFCS_(LAMBDADEFCAPT,SFINAE,MVFWD,QUALID,TEMPKW,...) \
7272
^
7373
mixed-bugfix-for-ufcs-non-local.cpp2:37:28: error: a lambda expression cannot appear in this context
7474
auto inline constexpr d{ t<CPP2_UFCS_NONLOCAL(f)(o)>() };// Fails on Clang 12 (lambda in unevaluated context).
7575
^
76-
../../../include/cpp2util.h:2137:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
76+
../../../include/cpp2util.h:10096:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
7777
#define CPP2_UFCS_NONLOCAL(...) CPP2_UFCS_(,CPP2_UFCS_IDENTITY,CPP2_UFCS_IDENTITY,(),,__VA_ARGS__)
7878
^
79-
../../../include/cpp2util.h:2099:66: note: expanded from macro 'CPP2_UFCS_'
79+
../../../include/cpp2util.h:10058:66: note: expanded from macro 'CPP2_UFCS_'
8080
#define CPP2_UFCS_(LAMBDADEFCAPT,SFINAE,MVFWD,QUALID,TEMPKW,...) \
8181
^
8282
mixed-bugfix-for-ufcs-non-local.cpp2:21:12: error: a lambda expression cannot appear in this context
8383
template<t<CPP2_UFCS_NONLOCAL(f)(o)> UnnamedTypeParam1_2> auto g() -> void{}// Fails on GCC ([GCC109781][]) and Clang 12 (a lambda expression cannot appear in this context)
8484
^
85-
../../../include/cpp2util.h:2137:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
85+
../../../include/cpp2util.h:10096:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
8686
#define CPP2_UFCS_NONLOCAL(...) CPP2_UFCS_(,CPP2_UFCS_IDENTITY,CPP2_UFCS_IDENTITY,(),,__VA_ARGS__)
8787
^
88-
../../../include/cpp2util.h:2099:66: note: expanded from macro 'CPP2_UFCS_'
88+
../../../include/cpp2util.h:10058:66: note: expanded from macro 'CPP2_UFCS_'
8989
#define CPP2_UFCS_(LAMBDADEFCAPT,SFINAE,MVFWD,QUALID,TEMPKW,...) \
9090
^
9191
mixed-bugfix-for-ufcs-non-local.cpp2:23:42: error: a lambda expression cannot appear in this context
9292
auto g([[maybe_unused]] cpp2::impl::in<t<CPP2_UFCS_NONLOCAL(f)(o)>> unnamed_param_1) -> void{}// Fails on Clang 12 (lambda in unevaluated context).
9393
^
94-
../../../include/cpp2util.h:2137:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
94+
../../../include/cpp2util.h:10096:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
9595
#define CPP2_UFCS_NONLOCAL(...) CPP2_UFCS_(,CPP2_UFCS_IDENTITY,CPP2_UFCS_IDENTITY,(),,__VA_ARGS__)
9696
^
97-
../../../include/cpp2util.h:2099:66: note: expanded from macro 'CPP2_UFCS_'
97+
../../../include/cpp2util.h:10058:66: note: expanded from macro 'CPP2_UFCS_'
9898
#define CPP2_UFCS_(LAMBDADEFCAPT,SFINAE,MVFWD,QUALID,TEMPKW,...) \
9999
^
100100
mixed-bugfix-for-ufcs-non-local.cpp2:27:29: error: a lambda expression cannot appear in this context
101101
[[nodiscard]] auto h() -> t<CPP2_UFCS_NONLOCAL(f)(o)> { return o; }// Fails on Clang 12 (lambda in unevaluated context).
102102
^
103-
../../../include/cpp2util.h:2137:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
103+
../../../include/cpp2util.h:10096:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
104104
#define CPP2_UFCS_NONLOCAL(...) CPP2_UFCS_(,CPP2_UFCS_IDENTITY,CPP2_UFCS_IDENTITY,(),,__VA_ARGS__)
105105
^
106-
../../../include/cpp2util.h:2099:66: note: expanded from macro 'CPP2_UFCS_'
106+
../../../include/cpp2util.h:10058:66: note: expanded from macro 'CPP2_UFCS_'
107107
#define CPP2_UFCS_(LAMBDADEFCAPT,SFINAE,MVFWD,QUALID,TEMPKW,...) \
108108
^
109109
mixed-bugfix-for-ufcs-non-local.cpp2:42:77: error: no matching function for call to object of type 'ns::u::(lambda at mixed-bugfix-for-ufcs-non-local.cpp2:42:77)'
110110
requires (std::is_convertible_v<CPP2_TYPEOF(x), std::add_const_t<decltype(CPP2_UFCS_NONLOCAL(f)(o))>&>) { return CPP2_FORWARD(x); }(true) };
111111
^~~~~~~~~~~~~~~~~~~~~
112-
../../../include/cpp2util.h:2137:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
112+
../../../include/cpp2util.h:10096:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
113113
#define CPP2_UFCS_NONLOCAL(...) CPP2_UFCS_(,CPP2_UFCS_IDENTITY,CPP2_UFCS_IDENTITY,(),,__VA_ARGS__)
114114
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
115-
../../../include/cpp2util.h:2099:66: note: expanded from macro 'CPP2_UFCS_'
115+
../../../include/cpp2util.h:10058:66: note: expanded from macro 'CPP2_UFCS_'
116116
#define CPP2_UFCS_(LAMBDADEFCAPT,SFINAE,MVFWD,QUALID,TEMPKW,...) \
117117
^
118118
mixed-bugfix-for-ufcs-non-local.cpp2:42:77: note: candidate template ignored: couldn't infer template argument 'Obj'
119-
../../../include/cpp2util.h:2137:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
119+
../../../include/cpp2util.h:10096:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
120120
#define CPP2_UFCS_NONLOCAL(...) CPP2_UFCS_(,CPP2_UFCS_IDENTITY,CPP2_UFCS_IDENTITY,(),,__VA_ARGS__)
121121
^
122-
../../../include/cpp2util.h:2099:66: note: expanded from macro 'CPP2_UFCS_'
122+
../../../include/cpp2util.h:10058:66: note: expanded from macro 'CPP2_UFCS_'
123123
#define CPP2_UFCS_(LAMBDADEFCAPT,SFINAE,MVFWD,QUALID,TEMPKW,...) \
124124
^
125125
mixed-bugfix-for-ufcs-non-local.cpp2:42:77: error: lambda expression in an unevaluated operand
126126
requires (std::is_convertible_v<CPP2_TYPEOF(x), std::add_const_t<decltype(CPP2_UFCS_NONLOCAL(f)(o))>&>) { return CPP2_FORWARD(x); }(true) };
127127
^
128-
../../../include/cpp2util.h:2137:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
128+
../../../include/cpp2util.h:10096:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
129129
#define CPP2_UFCS_NONLOCAL(...) CPP2_UFCS_(,CPP2_UFCS_IDENTITY,CPP2_UFCS_IDENTITY,(),,__VA_ARGS__)
130130
^
131-
../../../include/cpp2util.h:2099:66: note: expanded from macro 'CPP2_UFCS_'
131+
../../../include/cpp2util.h:10058:66: note: expanded from macro 'CPP2_UFCS_'
132132
#define CPP2_UFCS_(LAMBDADEFCAPT,SFINAE,MVFWD,QUALID,TEMPKW,...) \
133133
^
134134
14 errors generated.

Diff for: ‎regression-tests/test-results/clang-12-c++20/pure2-bugfix-for-ufcs-noexcept.cpp.output

+2-2
Original file line numberDiff line numberDiff line change
@@ -1,10 +1,10 @@
11
pure2-bugfix-for-ufcs-noexcept.cpp2:5:26: error: lambda expression in an unevaluated operand
22
static_assert(noexcept(CPP2_UFCS(swap)(t(), t())));// Fails on Clang 12 (lambda in unevaluated context) and GCC 10 (static assertion failed)
33
^
4-
../../../include/cpp2util.h:2132:59: note: expanded from macro 'CPP2_UFCS'
4+
../../../include/cpp2util.h:10091:59: note: expanded from macro 'CPP2_UFCS'
55
#define CPP2_UFCS(...) CPP2_UFCS_(&,CPP2_UFCS_EMPTY,CPP2_UFCS_IDENTITY,(),,__VA_ARGS__)
66
^
7-
../../../include/cpp2util.h:2099:66: note: expanded from macro 'CPP2_UFCS_'
7+
../../../include/cpp2util.h:10058:66: note: expanded from macro 'CPP2_UFCS_'
88
#define CPP2_UFCS_(LAMBDADEFCAPT,SFINAE,MVFWD,QUALID,TEMPKW,...) \
99
^
1010
1 error generated.

Diff for: ‎regression-tests/test-results/clang-12-c++20/pure2-bugfix-for-ufcs-sfinae.cpp.output

+4-4
Original file line numberDiff line numberDiff line change
@@ -1,19 +1,19 @@
11
pure2-bugfix-for-ufcs-sfinae.cpp2:1:78: error: lambda expression in an unevaluated operand
22
template<typename T> [[nodiscard]] auto f() -> std::type_identity_t<decltype(CPP2_UFCS_NONLOCAL(a)(T()))>;
33
^
4-
../../../include/cpp2util.h:2137:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
4+
../../../include/cpp2util.h:10096:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
55
#define CPP2_UFCS_NONLOCAL(...) CPP2_UFCS_(,CPP2_UFCS_IDENTITY,CPP2_UFCS_IDENTITY,(),,__VA_ARGS__)
66
^
7-
../../../include/cpp2util.h:2099:66: note: expanded from macro 'CPP2_UFCS_'
7+
../../../include/cpp2util.h:10058:66: note: expanded from macro 'CPP2_UFCS_'
88
#define CPP2_UFCS_(LAMBDADEFCAPT,SFINAE,MVFWD,QUALID,TEMPKW,...) \
99
^
1010
pure2-bugfix-for-ufcs-sfinae.cpp2:1:78: error: lambda expression in an unevaluated operand
1111
template<typename T> [[nodiscard]] auto f() -> std::type_identity_t<decltype(CPP2_UFCS_NONLOCAL(a)(T()))>{}// Fails on Clang 12 (lambda in unevaluated context).
1212
^
13-
../../../include/cpp2util.h:2137:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
13+
../../../include/cpp2util.h:10096:59: note: expanded from macro 'CPP2_UFCS_NONLOCAL'
1414
#define CPP2_UFCS_NONLOCAL(...) CPP2_UFCS_(,CPP2_UFCS_IDENTITY,CPP2_UFCS_IDENTITY,(),,__VA_ARGS__)
1515
^
16-
../../../include/cpp2util.h:2099:66: note: expanded from macro 'CPP2_UFCS_'
16+
../../../include/cpp2util.h:10058:66: note: expanded from macro 'CPP2_UFCS_'
1717
#define CPP2_UFCS_(LAMBDADEFCAPT,SFINAE,MVFWD,QUALID,TEMPKW,...) \
1818
^
1919
2 errors generated.

Diff for: ‎regression-tests/test-results/clang-12-c++20/pure2-last-use.cpp.output

+1-1
Original file line numberDiff line numberDiff line change
@@ -13,7 +13,7 @@ pure2-last-use.cpp2:344:16: error: no template named 'move_only_function' in nam
1313
pure2-last-use.cpp2:348:161: error: no member named 'move_only_function' in namespace 'std'
1414
CPP2_REQUIRES_ (std::is_convertible_v<CPP2_TYPEOF(a_), std::add_const_t<std::unique_ptr<int>>&> && std::is_convertible_v<CPP2_TYPEOF(b_), std::add_const_t<std::move_only_function<int()>>&> && std::is_convertible_v<CPP2_TYPEOF(c_), std::add_const_t<std::add_lvalue_reference_t<int>>&>) ;
1515
~~~~~^
16-
../../../include/cpp2util.h:10008:43: note: expanded from macro 'CPP2_REQUIRES_'
16+
../../../include/cpp2util.h:10109:43: note: expanded from macro 'CPP2_REQUIRES_'
1717
#define CPP2_REQUIRES_(...) requires (__VA_ARGS__)
1818
^~~~~~~~~~~
1919
pure2-last-use.cpp2:348:188: error: expected expression

Diff for: ‎regression-tests/test-results/gcc-10-c++20/mixed-increment-decrement.cpp.output

+2-2
Original file line numberDiff line numberDiff line change
@@ -1,10 +1,10 @@
11
mixed-increment-decrement.cpp2:4:47: error: expected ‘;’ at end of member declaration
22
In file included from mixed-increment-decrement.cpp:6:
3-
../../../include/cpp2util.h:10005:47: error: static assertion failed: GCC 11 or higher is required to support variables and type-scope functions that have a 'requires' clause. This includes a type-scope 'forward' parameter of non-wildcard type, such as 'func: (this, forward s: std::string)', which relies on being able to add a 'requires' clause - in that case, use 'forward s: _' instead if you need the result to compile with GCC 10.
3+
../../../include/cpp2util.h:10106:47: error: static assertion failed: GCC 11 or higher is required to support variables and type-scope functions that have a 'requires' clause. This includes a type-scope 'forward' parameter of non-wildcard type, such as 'func: (this, forward s: std::string)', which relies on being able to add a 'requires' clause - in that case, use 'forward s: _' instead if you need the result to compile with GCC 10.
44
mixed-increment-decrement.cpp2:5:1: note: in expansion of macro ‘CPP2_REQUIRES_’
55
mixed-increment-decrement.cpp2:4:39: error: expected ‘;’ at end of member declaration
66
In file included from mixed-increment-decrement.cpp:6:
7-
../../../include/cpp2util.h:10005:47: error: static assertion failed: GCC 11 or higher is required to support variables and type-scope functions that have a 'requires' clause. This includes a type-scope 'forward' parameter of non-wildcard type, such as 'func: (this, forward s: std::string)', which relies on being able to add a 'requires' clause - in that case, use 'forward s: _' instead if you need the result to compile with GCC 10.
7+
../../../include/cpp2util.h:10106:47: error: static assertion failed: GCC 11 or higher is required to support variables and type-scope functions that have a 'requires' clause. This includes a type-scope 'forward' parameter of non-wildcard type, such as 'func: (this, forward s: std::string)', which relies on being able to add a 'requires' clause - in that case, use 'forward s: _' instead if you need the result to compile with GCC 10.
88
mixed-increment-decrement.cpp2:5:1: note: in expansion of macro ‘CPP2_REQUIRES_’
99
mixed-increment-decrement.cpp2:4:32: error: no declaration matches ‘iterator<T>& iterator<T>::operator++() & requires true’
1010
mixed-increment-decrement.cpp2:4:18: note: candidates are: ‘iterator<T> iterator<T>::operator++(int) &’

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