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Tests for DR600-640. 

llvm-svn: 218591
This commit is contained in:
Richard Smith 2014-09-29 06:03:56 +00:00
parent 04b35e9beb
commit 31563ef090
2 changed files with 381 additions and 34 deletions
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347
clang/test/CXX/drs/dr6xx.cpp Normal file
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// RUN: %clang_cc1 -std=c++98 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++11 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++14 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++1z %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
namespace std { struct type_info {}; }
namespace dr601 { // dr601: yes
#if __cplusplus >= 201103L
#define MAX __LLONG_MAX__
#else
#define MAX __LONG_MAX__
#endif
#if 0x8000 < -1
#error 0x8000 should be signed
#endif
#if MAX > 0xFFFFFFFF && 0x80000000 < -1
#error 0x80000000 should be signed
#endif
#if __INT_MAX__ == 0x7FFFFFFF
_Static_assert(0x80000000 < -1, "0x80000000 should be unsigned"); // expected-error {{C11}}
#endif
#if MAX > 0xFFFFFFFFFFFFFFFF && 0x8000000000000000 < -1
#error 0x8000000000000000 should be signed
#endif
#if __cplusplus >= 201103L && __LLONG_MAX__ == 0x7FFFFFFFFFFFFFFF
static_assert(0x8000000000000000 < -1, "0x8000000000000000 should be unsigned"); // expected-error {{C11}}
#endif
#undef MAX
}
namespace dr602 { // dr602: yes
template<class T> struct A {
template<class U> friend struct A;
};
template<class T> struct B {
class C {
template<class U> friend struct B;
typedef int type;
};
typename C::type ct; // ok, befriended
};
B<int> b;
}
namespace dr603 { // dr603: yes
template<unsigned char> struct S {};
typedef S<'\001'> S1;
typedef S<(1ul << __CHAR_BIT__) + 1> S1;
#if __cplusplus >= 201103L
// expected-error@-2 {{cannot be narrowed}}
#endif
}
// dr604: na
// dr605 needs IRGen test
namespace dr606 { // dr606: yes
#if __cplusplus >= 201103L
template<typename T> struct S {};
template<typename T> void f(S<T> &&); // expected-note {{no known conversion from 'S<int>' to 'S<int> &&'}}
template<typename T> void g(T &&);
template<typename T> void h(const T &&); // expected-note {{no known conversion from 'S<int>' to 'const dr606::S<int> &&'}}
void test(S<int> s) {
f(s); // expected-error {{no match}}
g(s);
h(s); // expected-error {{no match}}
g(test);
h(test); // ok, an rvalue reference can bind to a function lvalue
}
#endif
}
namespace dr608 { // dr608: yes
struct A { virtual void f(); };
struct B : A {};
struct C : A { void f(); };
struct D : B, C {};
}
int dr610[-0u == 0u ? 1 : -1]; // dr610: yes
namespace dr611 { // dr611: yes
int k;
struct S { int &r; } s = { k ? k : k };
}
// dr612: na
namespace dr613 { // dr613: yes c++11
// see also n2253
struct A { int n; static void f(); };
int f(int);
struct B { virtual void f(); };
B &g(int);
int an1 = sizeof(A::n);
int an2 = sizeof(A::n + 1); // valid per dr850
int an3 = sizeof A::n;
int an4 = sizeof(f(A::n));
int an5 = sizeof(g(A::n));
const std::type_info &an6 = typeid(A::n);
const std::type_info &an7 = typeid(A::n + 1);
const std::type_info &an8 = typeid(f(A::n));
const std::type_info &an9 = typeid(g(A::n)); // expected-error {{non-static}}
#if __cplusplus < 201103L
// expected-error@-10 {{non-static}}
// expected-error@-10 {{non-static}}
// expected-error@-10 {{non-static}}
// expected-error@-10 {{non-static}}
// expected-error@-10 {{non-static}}
// expected-error@-10 {{non-static}}
// expected-error@-10 {{non-static}}
// expected-error@-10 {{non-static}}
#endif
void A::f() {
int an1 = sizeof n;
const std::type_info &an2 = typeid(n + 1);
#if __cplusplus < 201103L
// expected-error@-3 {{static}}
// expected-error@-3 {{static}}
#endif
const std::type_info &an3 = typeid(g(n)); // expected-error {{static}}
}
}
int dr614_a[(-1) / 2 == 0 ? 1 : -1]; // dr614: yes
int dr614_b[(-1) % 2 == -1 ? 1 : -1];
namespace dr615 { // dr615: yes
int f();
static int n = f();
}
namespace dr616 { // dr616: no
#if __cplusplus >= 201103L
struct S { int n; } s;
// FIXME: These should all be 'int &&'
using T = decltype(S().n); // expected-note 2{{previous}}
using T = decltype(static_cast<S&&>(s).n);
using T = decltype(S().*&S::n);
using T = decltype(static_cast<S&&>(s).*&S::n); // expected-error {{different type}}
using T = int&&; // expected-error {{different type}}
#endif
}
namespace dr618 { // dr618: yes
#if (unsigned)-1 > 0
#error wrong
#endif
}
namespace dr619 { // dr619: yes
extern int x[10];
struct S { static int x[10]; };
int x[];
_Static_assert(sizeof(x) == sizeof(int) * 10, ""); // expected-error {{C11}}
extern int x[];
_Static_assert(sizeof(x) == sizeof(int) * 10, ""); // expected-error {{C11}}
int S::x[];
_Static_assert(sizeof(S::x) == sizeof(int) * 10, ""); // expected-error {{C11}}
void f() {
extern int x[];
sizeof(x); // expected-error {{incomplete}}
}
}
// dr620: dup 568
namespace dr621 {
template<typename T> T f();
template<> int f() {} // expected-note {{previous}}
template<> int f<int>() {} // expected-error {{redefinition}}
}
// dr623: na
// FIXME: Add documentation saying we allow invalid pointer values.
// dr624 needs an IRGen check.
namespace dr625 { // dr625: yes
template<typename T> struct A {};
A<auto> x = A<int>(); // expected-error {{'auto' not allowed in template argument}} expected-error 0-1{{extension}}
void f(int);
void (*p)(auto) = f; // expected-error {{'auto' not allowed in function prototype}} expected-error 0-1{{extension}}
}
namespace dr626 { // dr626: yes
#define STR(x) #x
char c[2] = STR(c); // ok, type matches
wchar_t w[2] = STR(w); // expected-error {{initializing wide char array with non-wide string literal}}
}
namespace dr627 { // dr627: yes
void f() {
true a = 0; // expected-error +{{}} expected-warning {{unused}}
}
}
// dr628: na
namespace dr629 { // dr629: yes
typedef int T;
int n = 1;
void f() {
auto T = 2;
#if __cplusplus < 201103L
// expected-error@-2 {{expected unqualified-id}}
#else
// expected-note@-4 {{previous}}
#endif
auto T(n);
#if __cplusplus >= 201103L
// expected-error@-2 {{redefinition of 'T'}}
#endif
}
}
namespace dr630 { // dr630: yes
const bool MB_EQ_WC =
' ' == L' ' && '\t' == L'\t' && '\v' == L'\v' && '\r' == L'\r' &&
'\n' == L'\n' && //
'a' == L'a' && 'b' == L'b' && 'c' == L'c' && 'd' == L'd' && 'e' == L'e' &&
'f' == L'f' && 'g' == L'g' && 'h' == L'h' && 'i' == L'i' && 'j' == L'j' &&
'k' == L'k' && 'l' == L'l' && 'm' == L'm' && 'n' == L'n' && 'o' == L'o' &&
'p' == L'p' && 'q' == L'q' && 'r' == L'r' && 's' == L's' && 't' == L't' &&
'u' == L'u' && 'v' == L'v' && 'w' == L'w' && 'x' == L'x' && 'y' == L'y' &&
'z' == L'z' && //
'A' == L'A' && 'B' == L'B' && 'C' == L'C' && 'D' == L'D' && 'E' == L'E' &&
'F' == L'F' && 'G' == L'G' && 'H' == L'H' && 'I' == L'I' && 'J' == L'J' &&
'K' == L'K' && 'L' == L'L' && 'M' == L'M' && 'N' == L'N' && 'O' == L'O' &&
'P' == L'P' && 'Q' == L'Q' && 'R' == L'R' && 'S' == L'S' && 'T' == L'T' &&
'U' == L'U' && 'V' == L'V' && 'W' == L'W' && 'X' == L'X' && 'Y' == L'Y' &&
'Z' == L'Z' && //
'0' == L'0' && '1' == L'1' && '2' == L'2' && '3' == L'3' && '4' == L'4' &&
'5' == L'5' && '6' == L'6' && '7' == L'7' && '8' == L'8' &&
'9' == L'9' && //
'_' == L'_' && '{' == L'{' && '}' == L'}' && '[' == L'[' && ']' == L']' &&
'#' == L'#' && '(' == L'(' && ')' == L')' && '<' == L'<' && '>' == L'>' &&
'%' == L'%' && ':' == L':' && ';' == L';' && '.' == L'.' && '?' == L'?' &&
'*' == L'*' && '+' == L'+' && '-' == L'-' && '/' == L'/' && '^' == L'^' &&
'&' == L'&' && '|' == L'|' && '~' == L'~' && '!' == L'!' && '=' == L'=' &&
',' == L',' && '\\' == L'\\' && '"' == L'"' && '\'' == L'\'';
#if __STDC_MB_MIGHT_NEQ_WC__
_Static_assert(!MB_EQ_WC, "__STDC_MB_MIGHT_NEQ_WC__ but all basic source characters have same representation"); // expected-error {{C11}}
#else
_Static_assert(MB_EQ_WC, "!__STDC_MB_MIGHT_NEQ_WC__ but some character differs"); // expected-error {{C11}}
#endif
}
// dr631: na
namespace dr632 { // dr632: yes
struct S { int n; } s = {{5}}; // expected-warning {{braces}}
}
// dr633: na
// see also n2993
namespace dr634 { // dr634: yes
struct S { S(); S(const S&); virtual void f(); ~S(); };
int f(...);
char f(int);
template<typename T> int (&g(T))[sizeof f(T())];
int (&a)[sizeof(int)] = g(S());
int (&b)[1] = g(0);
int k = f(S()); // expected-error {{cannot pass}}
}
namespace dr635 { // dr635: yes
template<typename T> struct A { A(); ~A(); };
template<typename T> A<T>::A<T>() {} // expected-error {{cannot have template arguments}}
template<typename T> A<T>::~A<T>() {}
template<typename T> struct B { B(); ~B(); };
template<typename T> B<T>::B() {}
template<typename T> B<T>::~B() {}
struct C { template<typename T> C(); C(); };
template<typename T> C::C() {}
C::C() {}
template<> C::C<int>() {} // expected-error {{constructor name}} expected-error {{unqualified-id}}
/*FIXME: needed for error recovery:*/;
template<typename T> struct D { template<typename U> D(); D(); };
template<typename T> D<T>::D() {} // expected-note {{previous}}
template<typename T> template<typename U> D<T>::D() {}
template<typename T> D<T>::D<T>() {} // expected-error {{redefinition}} expected-error {{cannot have template arg}}
}
namespace dr637 { // dr637: yes
void f(int i) {
i = ++i + 1;
i = i++ + 1; // expected-warning {{unsequenced}}
}
}
namespace dr638 { // dr638: no
template<typename T> struct A {
struct B;
void f();
void g();
struct C {
void h();
};
};
class X {
typedef int type;
template<class T> friend struct A<T>::B; // expected-warning {{not supported}}
template<class T> friend void A<T>::f(); // expected-warning {{not supported}}
template<class T> friend void A<T>::g(); // expected-warning {{not supported}}
template<class T> friend void A<T>::C::h(); // expected-warning {{not supported}}
};
template<> struct A<int> {
X::type a; // FIXME: private
struct B {
X::type b; // ok
};
int f() { X::type c; } // FIXME: private
void g() { X::type d; } // ok
struct D {
void h() { X::type e; } // FIXME: private
};
};
}
namespace dr639 { // dr639: yes
void f(int i) {
void((i = 0) + (i = 0)); // expected-warning {{unsequenced}}
}
}

68
clang/www/cxx_dr_status.html
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@ -969,7 +969,7 @@
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_closed.html#155">155</a></td>
<td>dup</td>
<td>Brace initializer for scalar</td>
<td class="none" align="center">Duplicate of <a href="#632">632</a></td>
<td class="full" align="center">Duplicate of <a href="#632">632</a></td>
</tr>
<tr class="open" id="156">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#156">156</a></td>
@ -1372,7 +1372,7 @@ accessible?</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#222">222</a></td>
<td>CD1</td>
<td>Sequence points and lvalue-returning operators</td>
<td class="none" align="center">Duplicate of <a href="#637">637</a></td>
<td class="full" align="center">Duplicate of <a href="#637">637</a></td>
</tr>
<tr id="223">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#223">223</a></td>
@ -3463,7 +3463,7 @@ and <I>POD class</I></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#570">570</a></td>
<td>CD2</td>
<td>Are references subject to the ODR?</td>
<td class="none" align="center">Duplicate of <a href="#633">633</a></td>
<td class="na" align="center">Duplicate of <a href="#633">633</a></td>
</tr>
<tr id="571">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#571">571</a></td>
@ -3649,25 +3649,25 @@ and <I>POD class</I></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#601">601</a></td>
<td>CD2</td>
<td>Type of literals in preprocessing expressions</td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Yes</td>
</tr>
<tr id="602">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#602">602</a></td>
<td>C++11</td>
<td>When is the injected-class-name of a class template a template?</td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Yes</td>
</tr>
<tr id="603">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#603">603</a></td>
<td>CD1</td>
<td>Type equivalence and unsigned overflow</td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Yes</td>
</tr>
<tr id="604">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#604">604</a></td>
<td>CD2</td>
<td>Argument list for overload resolution in copy-initialization</td>
<td class="none" align="center">Unknown</td>
<td class="na" align="center">N/A</td>
</tr>
<tr id="605">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#605">605</a></td>
@ -3679,7 +3679,7 @@ and <I>POD class</I></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#606">606</a></td>
<td>CD1</td>
<td>Template argument deduction for rvalue references</td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Yes</td>
</tr>
<tr class="open" id="607">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#607">607</a></td>
@ -3691,7 +3691,7 @@ and <I>POD class</I></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#608">608</a></td>
<td>CD2</td>
<td>Determining the final overrider of a virtual function</td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Yes</td>
</tr>
<tr id="609">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#609">609</a></td>
@ -3703,43 +3703,43 @@ and <I>POD class</I></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_closed.html#610">610</a></td>
<td>NAD</td>
<td>Computing the negative of <TT>0U</TT></td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Yes</td>
</tr>
<tr id="611">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#611">611</a></td>
<td>CD2</td>
<td>Zero-initializing references</td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Yes</td>
</tr>
<tr id="612">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#612">612</a></td>
<td>CD2</td>
<td>Requirements on a conforming implementation</td>
<td class="none" align="center">Unknown</td>
<td class="na" align="center">N/A</td>
</tr>
<tr id="613">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#613">613</a></td>
<td>CD1</td>
<td>Unevaluated uses of non-static class members</td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Yes (C++11 onwards)</td>
</tr>
<tr id="614">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#614">614</a></td>
<td>CD1</td>
<td>Results of integer <TT>/</TT> and <TT>%</TT></td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Yes</td>
</tr>
<tr id="615">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#615">615</a></td>
<td>C++11</td>
<td>Incorrect description of variables that can be initialized</td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Yes</td>
</tr>
<tr id="616">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#616">616</a></td>
<td>CD3</td>
<td>Definition of &#8220;indeterminate value&#8221;</td>
<td class="none" align="center">Unknown</td>
<td class="none" align="center">No</td>
</tr>
<tr class="open" id="617">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#617">617</a></td>
@ -3751,19 +3751,19 @@ and <I>POD class</I></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#618">618</a></td>
<td>CD2</td>
<td>Casts in preprocessor conditional expressions</td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Yes</td>
</tr>
<tr id="619">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#619">619</a></td>
<td>C++11</td>
<td>Completeness of array types</td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Yes</td>
</tr>
<tr id="620">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#620">620</a></td>
<td>CD1</td>
<td>Declaration order in layout-compatible POD structs</td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Duplicate of <a href="#568">568</a></td>
</tr>
<tr id="621">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#621">621</a></td>
@ -3781,7 +3781,7 @@ and <I>POD class</I></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#623">623</a></td>
<td>CD3</td>
<td>Use of pointers to deallocated storage</td>
<td class="none" align="center">Unknown</td>
<td class="na" align="center">N/A</td>
</tr>
<tr id="624">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#624">624</a></td>
@ -3793,67 +3793,67 @@ and <I>POD class</I></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#625">625</a></td>
<td>CD2</td>
<td>Use of <TT>auto</TT> as a <I>template-argument</I></td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Yes</td>
</tr>
<tr id="626">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#626">626</a></td>
<td>CD2</td>
<td>Preprocessor string literals</td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Yes</td>
</tr>
<tr id="627">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_closed.html#627">627</a></td>
<td>NAD</td>
<td>Values behaving as types</td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Yes</td>
</tr>
<tr id="628">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#628">628</a></td>
<td>CD2</td>
<td>The values of an enumeration with no enumerator</td>
<td class="none" align="center">Unknown</td>
<td class="na" align="center">N/A</td>
</tr>
<tr id="629">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#629">629</a></td>
<td>CD1</td>
<td><TT>auto</TT> parsing ambiguity</td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Yes</td>
</tr>
<tr id="630">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#630">630</a></td>
<td>CD2</td>
<td>Equality of narrow and wide character values in the basic character set</td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Yes</td>
</tr>
<tr id="631">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#631">631</a></td>
<td>CD3</td>
<td>Jumping into a &#8220;then&#8221; clause</td>
<td class="none" align="center">Unknown</td>
<td class="na" align="center">N/A</td>
</tr>
<tr id="632">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#632">632</a></td>
<td>CD1</td>
<td>Brace-enclosed initializer for scalar member of aggregate</td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Yes</td>
</tr>
<tr id="633">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#633">633</a></td>
<td>CD2</td>
<td>Specifications for variables that should also apply to references</td>
<td class="none" align="center">Unknown</td>
<td class="na" align="center">N/A</td>
</tr>
<tr id="634">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#634">634</a></td>
<td>CD1</td>
<td>Conditionally-supported behavior for non-POD objects passed to ellipsis redux</td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Yes</td>
</tr>
<tr id="635">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_closed.html#635">635</a></td>
<td>NAD</td>
<td>Names of constructors and destructors of templates</td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Yes</td>
</tr>
<tr class="open" id="636">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#636">636</a></td>
@ -3865,19 +3865,19 @@ and <I>POD class</I></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#637">637</a></td>
<td>CD1</td>
<td>Sequencing rules and example disagree</td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Yes</td>
</tr>
<tr id="638">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#638">638</a></td>
<td>CD2</td>
<td>Explicit specialization and friendship</td>
<td class="none" align="center">Unknown</td>
<td class="none" align="center">No</td>
</tr>
<tr id="639">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#639">639</a></td>
<td>CD1</td>
<td>What makes side effects &#8220;different&#8221; from one another?</td>
<td class="none" align="center">Unknown</td>
<td class="full" align="center">Yes</td>
</tr>
<tr class="open" id="640">
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#640">640</a></td>