[Clang] Added explanation why `is_constructible` evaluated to false. #143309

egorshamshura · 2025-06-08T13:17:35Z

Added explanation why a is constructible evaluated to false. Also fixed problem with ExtractTypeTraitFromExpression. In case std::is_xxx_v<> with variadic pack it tries to get template argument, but fails in expression Arg.getAsType() due to Arg.getKind() == TemplateArgument::ArgKind::Pack, but not TemplateArgument::ArgKind::Type.

… it is pack; added is_constructible support

llvmbot · 2025-06-08T13:18:11Z

@llvm/pr-subscribers-clang

Author: Shamshura Egor (egorshamshura)

Changes

Also fixed problem with ExtractTypeTraitFromExpression. In case std::is_xxx_v<> with variadic pack it tries to get template argument, but fails in expression Arg.getAsType() due to Arg.getKind() == TemplateArgument::ArgKind::Pack, but not TemplateArgument::ArgKind::Type.

Full diff: https://github.com/llvm/llvm-project/pull/143309.diff

4 Files Affected:

(modified) clang/include/clang/Basic/DiagnosticSemaKinds.td (+5-2)
(modified) clang/lib/Sema/SemaTypeTraits.cpp (+33-2)
(modified) clang/test/SemaCXX/type-traits-unsatisfied-diags-std.cpp (+72)
(modified) clang/test/SemaCXX/type-traits-unsatisfied-diags.cpp (+44)

diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index 5f44d503580b9..b04537d2cac3c 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -1765,7 +1765,8 @@ def err_user_defined_msg_constexpr : Error<
 // Type traits explanations
 def note_unsatisfied_trait : Note<"%0 is not %enum_select<TraitName>{"
                                   "%TriviallyRelocatable{trivially relocatable}|"
-                                  "%TriviallyCopyable{trivially copyable}"
+                                  "%TriviallyCopyable{trivially copyable}|"
+                                  "%Constructible{constructible with provided types}"
                                   "}1">;
 
 def note_unsatisfied_trait_reason
@@ -1785,7 +1786,9 @@ def note_unsatisfied_trait_reason
            "%UserProvidedAssign{has a user provided %select{copy|move}1 "
            "assignment operator}|"
            "%UnionWithUserDeclaredSMF{is a union with a user-declared "
-           "%sub{select_special_member_kind}1}"
+           "%sub{select_special_member_kind}1}|"
+           "%FunctionType{is a function type}|"
+           "%CVVoidType{is a cv void type}"
            "}0">;
 
 def warn_consteval_if_always_true : Warning<
diff --git a/clang/lib/Sema/SemaTypeTraits.cpp b/clang/lib/Sema/SemaTypeTraits.cpp
index 330f2aa750a09..37fe965815269 100644
--- a/clang/lib/Sema/SemaTypeTraits.cpp
+++ b/clang/lib/Sema/SemaTypeTraits.cpp
@@ -21,6 +21,7 @@
 #include "clang/Sema/Overload.h"
 #include "clang/Sema/Sema.h"
 #include "clang/Sema/SemaHLSL.h"
+#include "llvm/Support/raw_ostream.h"
 
 using namespace clang;
 
@@ -1941,6 +1942,7 @@ static std::optional<TypeTrait> StdNameToTypeTrait(StringRef Name) {
       .Case("is_trivially_relocatable",
             TypeTrait::UTT_IsCppTriviallyRelocatable)
       .Case("is_trivially_copyable", TypeTrait::UTT_IsTriviallyCopyable)
+      .Case("is_constructible", TypeTrait::TT_IsConstructible)
       .Default(std::nullopt);
 }
 
@@ -1977,8 +1979,14 @@ static ExtractedTypeTraitInfo ExtractTypeTraitFromExpression(const Expr *E) {
     Trait = StdNameToTypeTrait(Name);
     if (!Trait)
       return std::nullopt;
-    for (const auto &Arg : VD->getTemplateArgs().asArray())
-      Args.push_back(Arg.getAsType());
+    for (const auto &Arg : VD->getTemplateArgs().asArray()) {
+      if (Arg.getKind() == TemplateArgument::ArgKind::Pack) {
+        for (const auto &InnerArg : Arg.pack_elements())
+          Args.push_back(InnerArg.getAsType());
+      }
+      if (Arg.getKind() == TemplateArgument::ArgKind::Type)
+        Args.push_back(Arg.getAsType());
+    }
     return {{Trait.value(), std::move(Args)}};
   }
 
@@ -2159,6 +2167,26 @@ static void DiagnoseNonTriviallyCopyableReason(Sema &SemaRef,
   }
 }
 
+static void DiagnoseNonConstructibleReason(Sema &SemaRef, SourceLocation Loc,
+                                           QualType T) {
+  SemaRef.Diag(Loc, diag::note_unsatisfied_trait)
+      << T << diag::TraitName::Constructible;
+
+  if (T->isFunctionType())
+    SemaRef.Diag(Loc, diag::note_unsatisfied_trait_reason)
+        << diag::TraitNotSatisfiedReason::FunctionType;
+
+  if (T->isVoidType())
+    SemaRef.Diag(Loc, diag::note_unsatisfied_trait_reason)
+        << diag::TraitNotSatisfiedReason::CVVoidType;
+
+  const CXXRecordDecl *D = T->getAsCXXRecordDecl();
+  if (!D || D->isInvalidDecl() || !D->hasDefinition())
+    return;
+
+  SemaRef.Diag(D->getLocation(), diag::note_defined_here) << D;
+}
+
 static void DiagnoseNonTriviallyCopyableReason(Sema &SemaRef,
                                                SourceLocation Loc, QualType T) {
   SemaRef.Diag(Loc, diag::note_unsatisfied_trait)
@@ -2195,6 +2223,9 @@ void Sema::DiagnoseTypeTraitDetails(const Expr *E) {
   case UTT_IsTriviallyCopyable:
     DiagnoseNonTriviallyCopyableReason(*this, E->getBeginLoc(), Args[0]);
     break;
+  case TT_IsConstructible:
+    DiagnoseNonConstructibleReason(*this, E->getBeginLoc(), Args[0]);
+    break;
   default:
     break;
   }
diff --git a/clang/test/SemaCXX/type-traits-unsatisfied-diags-std.cpp b/clang/test/SemaCXX/type-traits-unsatisfied-diags-std.cpp
index 498e202e26265..b9ee677a1cffc 100644
--- a/clang/test/SemaCXX/type-traits-unsatisfied-diags-std.cpp
+++ b/clang/test/SemaCXX/type-traits-unsatisfied-diags-std.cpp
@@ -20,6 +20,14 @@ struct is_trivially_copyable {
 
 template <typename T>
 constexpr bool is_trivially_copyable_v = __is_trivially_copyable(T);
+
+template <typename... Args>
+struct is_constructible {
+    static constexpr bool value = __is_constructible(Args...);
+};
+
+template <typename... Args>
+constexpr bool is_constructible_v = __is_constructible(Args...);
 #endif
 
 #ifdef STD2
@@ -44,6 +52,17 @@ using is_trivially_copyable  = __details_is_trivially_copyable<T>;
 
 template <typename T>
 constexpr bool is_trivially_copyable_v = __is_trivially_copyable(T);
+
+template <typename... Args>
+struct __details_is_constructible{
+    static constexpr bool value = __is_constructible(Args...);
+};
+
+template <typename... Args>
+using is_constructible  = __details_is_constructible<Args...>;
+
+template <typename... Args>
+constexpr bool is_constructible_v = __is_constructible(Args...);
 #endif
 
 
@@ -73,6 +92,15 @@ using is_trivially_copyable  = __details_is_trivially_copyable<T>;
 
 template <typename T>
 constexpr bool is_trivially_copyable_v = is_trivially_copyable<T>::value;
+
+template <typename... Args>
+struct __details_is_constructible : bool_constant<__is_constructible(Args...)> {};
+
+template <typename... Args>
+using is_constructible  = __details_is_constructible<Args...>;
+
+template <typename... Args>
+constexpr bool is_constructible_v = is_constructible<Args...>::value;
 #endif
 
 }
@@ -100,6 +128,17 @@ static_assert(std::is_trivially_copyable_v<int&>);
 // expected-note@-1 {{because it is a reference type}}
 
 
+static_assert(std::is_constructible<int, int>::value);
+
+static_assert(std::is_constructible<void>::value);
+// expected-error-re@-1 {{static assertion failed due to requirement 'std::{{.*}}is_constructible<void>::value'}} \
+// expected-note@-1 {{'void' is not constructible with provided types}} \
+// expected-note@-1 {{because it is a cv void type}}
+static_assert(std::is_constructible_v<void>);
+// expected-error@-1 {{static assertion failed due to requirement 'std::is_constructible_v<void>'}} \
+// expected-note@-1 {{'void' is not constructible with provided types}} \
+// expected-note@-1 {{because it is a cv void type}}
+
 namespace test_namespace {
     using namespace std;
     static_assert(is_trivially_relocatable<int&>::value);
@@ -119,6 +158,15 @@ namespace test_namespace {
     // expected-error@-1 {{static assertion failed due to requirement 'is_trivially_copyable_v<int &>'}} \
     // expected-note@-1 {{'int &' is not trivially copyable}} \
     // expected-note@-1 {{because it is a reference type}}
+
+    static_assert(is_constructible<void>::value);
+    // expected-error-re@-1 {{static assertion failed due to requirement '{{.*}}is_constructible<void>::value'}} \
+    // expected-note@-1 {{'void' is not constructible with provided types}} \
+    // expected-note@-1 {{because it is a cv void type}}
+    static_assert(is_constructible_v<void>);
+    // expected-error@-1 {{static assertion failed due to requirement 'is_constructible_v<void>'}} \
+    // expected-note@-1 {{'void' is not constructible with provided types}} \
+    // expected-note@-1 {{because it is a cv void type}}
 }
 
 
@@ -139,6 +187,15 @@ concept C2 = std::is_trivially_copyable_v<T>; // #concept4
 
 template <C2 T> void g2();  // #cand4
 
+template <typename... Args>
+requires std::is_constructible<Args...>::value void f3();  // #cand5
+
+template <typename... Args>
+concept C3 = std::is_constructible_v<Args...>; // #concept6
+
+template <C3 T> void g3();  // #cand6
+
+
 void test() {
     f<int&>();
     // expected-error@-1 {{no matching function for call to 'f'}} \
@@ -169,5 +226,20 @@ void test() {
     // expected-note@#concept4 {{because 'std::is_trivially_copyable_v<int &>' evaluated to false}} \
     // expected-note@#concept4 {{'int &' is not trivially copyable}} \
     // expected-note@#concept4 {{because it is a reference type}}
+
+    f3<void>();
+    // expected-error@-1 {{no matching function for call to 'f3'}} \
+    // expected-note@#cand5 {{candidate template ignored: constraints not satisfied [with Args = <void>]}} \
+    // expected-note-re@#cand5 {{because '{{.*}}is_constructible<void>::value' evaluated to false}} \
+    // expected-note@#cand5 {{'void' is not constructible with provided types}} \
+    // expected-note@#cand5 {{because it is a cv void type}}
+
+    g3<void>();
+    // expected-error@-1 {{no matching function for call to 'g3'}} \
+    // expected-note@#cand6 {{candidate template ignored: constraints not satisfied [with T = void]}} \
+    // expected-note@#cand6 {{because 'void' does not satisfy 'C3'}} \
+    // expected-note@#concept6 {{because 'std::is_constructible_v<void>' evaluated to false}} \
+    // expected-note@#concept6 {{'void' is not constructible with provided types}} \
+    // expected-note@#concept6 {{because it is a cv void type}}
 }
 }
diff --git a/clang/test/SemaCXX/type-traits-unsatisfied-diags.cpp b/clang/test/SemaCXX/type-traits-unsatisfied-diags.cpp
index 0256569fcca5f..9e668ef86b31a 100644
--- a/clang/test/SemaCXX/type-traits-unsatisfied-diags.cpp
+++ b/clang/test/SemaCXX/type-traits-unsatisfied-diags.cpp
@@ -290,3 +290,47 @@ static_assert(__is_trivially_copyable(S12));
 // expected-note@-1 {{'S12' is not trivially copyable}} \
 // expected-note@#tc-S12 {{'S12' defined here}}
 }
+
+namespace constructible {
+
+struct S1 { // #c-S1
+    S1(int);
+};
+static_assert(__is_constructible(S1, int, float));
+// expected-error@-1 {{static assertion failed due to requirement '__is_constructible(constructible::S1, int, float)'}} \
+// expected-note@-1 {{'S1' is not constructible with provided types}} \
+// expected-note@#c-S1 {{'S1' defined here}}
+
+struct S2 { // #c-S2
+    S2(int, float, double);
+};
+static_assert(__is_constructible(S2, float));
+// expected-error@-1 {{static assertion failed due to requirement '__is_constructible(constructible::S2, float)'}} \
+// expected-note@-1 {{'S2' is not constructible with provided types}} \
+// expected-note@#c-S2 {{'S2' defined here}}
+
+static_assert(__is_constructible(void));
+// expected-error@-1 {{static assertion failed due to requirement '__is_constructible(void)'}} \
+// expected-note@-1 {{'void' is not constructible with provided types}} \
+// expected-note@-1 {{because it is a cv void type}}
+
+static_assert(__is_constructible(const void));
+// expected-error@-1 {{static assertion failed due to requirement '__is_constructible(const void)'}} \
+// expected-note@-1 {{'const void' is not constructible with provided types}} \
+// expected-note@-1 {{because it is a cv void type}}
+
+static_assert(__is_constructible(volatile void));
+// expected-error@-1 {{static assertion failed due to requirement '__is_constructible(volatile void)'}} \
+// expected-note@-1 {{'volatile void' is not constructible with provided types}} \
+// expected-note@-1 {{because it is a cv void type}}
+
+static_assert(__is_constructible(int ()));
+// expected-error@-1 {{static assertion failed due to requirement '__is_constructible(int ())'}} \
+// expected-note@-1 {{'int ()' is not constructible with provided types}} \
+// expected-note@-1 {{because it is a function type}}
+
+static_assert(__is_constructible(void (int, float)));
+// expected-error@-1 {{static assertion failed due to requirement '__is_constructible(void (int, float))'}} \
+// expected-note@-1 {{'void (int, float)' is not constructible with provided types}} \
+// expected-note@-1 {{because it is a function type}}
+}

cor3ntin

Thanks a lot for working on that

cor3ntin · 2025-06-08T14:52:40Z

clang/lib/Sema/SemaTypeTraits.cpp

@@ -2159,6 +2167,26 @@ static void DiagnoseNonTriviallyCopyableReason(Sema &SemaRef,
  }
 }

+static void DiagnoseNonConstructibleReason(Sema &SemaRef, SourceLocation Loc,
+                                           QualType T) {
+  SemaRef.Diag(Loc, diag::note_unsatisfied_trait)


I think what would be useful here is to try to run overload resolution again on all the arguments,
and show the errors - https://compiler-explorer.com/z/aMG1nEoz1

You can look at how static bool EvaluateBooleanTypeTrait works (in the same file).

I think that by calling InitializationSequence::Diagnose we would get super useful diagnostics.

We don't have a good way to turn the errors that would be produced into notes, though @AaronBallman @erichkeane @Sirraide - but maybe emitting errors is good enough as a first approach

We don't have a good way to turn the errors that would be produced into notes

I’m working on something diagnostics-related right now that would allow nesting errors but it’s not finished yet. Because of how that works though it should be straight-forward to add the nesting later, so just emitting the errors for now should be fine imo.

Thanks for your advice @cor3ntin (and also can i ping you?). I have tried to use InitializationSequence::Diagnose. However I'm dealing with some issues.

InitializationSequence::Diagnose does not emit any diagnostic. It correctly returns true or false, but nothing appears in console. Although the FailureKind in InitializationSequence is defined correctly.

After InitializationSequence::Diagnose I can not use SemaRef.Diag. Nothing is being written to the console. However I can write in llvm::errs manually.
So, can you please help me understand what I'm doing wrong? I have uploaded the latest update.

Well, I figured it out! SFINAETrap was the problem. So now it works as expected.

…version.

clang/test/CXX/drs/cwg18xx.cpp

cor3ntin

Looks great, except for a check that does not seem to be useful

cor3ntin · 2025-06-12T09:18:47Z

clang/lib/Sema/SemaTypeTraits.cpp

+    if (ArgTy->isIncompleteType()) {
+      SemaRef.Diag(Loc, diag::err_incomplete_type_used_in_type_trait_expr)
+          << ArgTy;
+      CompleteTypes = false;
+    }
+  }
+  if (!CompleteTypes)
+    return;


Incomplete types should have been diagnosed already, so the check for incomplete type is not useful (we do need checks for void and incomplete array types)
https://godbolt.org/z/hc5jrjz51

Is it good now? According to my observations when Args contains cv void type it is always evaluated to false, however I can not say the same about incomplete array types.

And now, for every cv void type, we show a note, but is this a good practice? Or do we want to show it once?

So I decided to show it once

…for T. Updated tests.

erichkeane

Few comments, but generally looks good to me.

erichkeane · 2025-06-12T15:53:11Z

clang/lib/Sema/SemaTypeTraits.cpp

+    for (const auto &Arg : VD->getTemplateArgs().asArray()) {
+      if (Arg.getKind() == TemplateArgument::ArgKind::Pack) {
+        for (const auto &InnerArg : Arg.pack_elements())
+          Args.push_back(InnerArg.getAsType());


IS this a valid assumption here (that this is a type?). Presumably this could be an NTTP pack as well...

Though getAsType would assert for us?

getAsType would assert for us

erichkeane · 2025-06-12T15:53:20Z

clang/lib/Sema/SemaTypeTraits.cpp

+        for (const auto &InnerArg : Arg.pack_elements())
+          Args.push_back(InnerArg.getAsType());
+      }
+      if (Arg.getKind() == TemplateArgument::ArgKind::Type)


Suggested change

if (Arg.getKind() == TemplateArgument::ArgKind::Type)

else if (Arg.getKind() == TemplateArgument::ArgKind::Type)

erichkeane · 2025-06-12T15:53:46Z

clang/lib/Sema/SemaTypeTraits.cpp

+      }
+      if (Arg.getKind() == TemplateArgument::ArgKind::Type)
+        Args.push_back(Arg.getAsType());
+    }


If the kind is neither, we should probably do SOMETHING about it, even if it is just an assert.

Added assert

erichkeane · 2025-06-12T15:54:04Z

clang/lib/Sema/SemaTypeTraits.cpp

+static void DiagnoseNonConstructibleReason(
+    Sema &SemaRef, SourceLocation Loc,
+    const llvm::SmallVector<clang::QualType, 1> &Ts) {
+  for (const auto &ArgTy : Ts) {


Suggested change

for (const auto &ArgTy : Ts) {

for (const QualType &ArgTy : Ts) {

erichkeane · 2025-06-12T15:55:26Z

clang/lib/Sema/SemaTypeTraits.cpp

+          << diag::TraitNotSatisfiedReason::CVVoidType;
+  }
+
+  QualType T = Ts[0];


Do we know that Ts is >=1? in size? Maybe early-exit if Ts.empty?

Added early-exit, thanks

erichkeane · 2025-06-12T20:00:51Z

clang/lib/Sema/SemaTypeTraits.cpp

+      if (Arg.getKind() == TemplateArgument::ArgKind::Pack) {
+        for (const auto &InnerArg : Arg.pack_elements())
+          Args.push_back(InnerArg.getAsType());
+      } else if (Arg.getKind() == TemplateArgument::ArgKind::Type)


This else if still needs curley brackets, since its if did.

Fixed, added curley brackets

erichkeane · 2025-06-12T20:01:05Z

clang/lib/Sema/SemaTypeTraits.cpp

+          Args.push_back(InnerArg.getAsType());
+      } else if (Arg.getKind() == TemplateArgument::ArgKind::Type)
+        Args.push_back(Arg.getAsType());
+      assert((Arg.getKind() == TemplateArgument::ArgKind::Type ||


I'd suggest just putting an llvm_unreachable in the else branch instead.

changed assert to llvm_unreachable

cor3ntin

LGTM. Thanks a lot.
Will you need us to merge that for you?

egorshamshura · 2025-06-13T07:34:12Z

LGTM. Thanks a lot. Will you need us to merge that for you?
Yes, thanks!

mikaelholmen · 2025-06-13T11:13:31Z

Hi @egorshamshura and @cor3ntin

It seems like a bunch of libc++ testcases start failing with this patch:

Failed Tests (9):
  llvm-libc++-shared.cfg.in :: libcxx/selftest/dsl/dsl.sh.py
  llvm-libc++-shared.cfg.in :: libcxx/utilities/expected/expected.expected/and_then.mandates.verify.cpp
  llvm-libc++-shared.cfg.in :: libcxx/utilities/expected/expected.expected/or_else.mandates.verify.cpp
  llvm-libc++-shared.cfg.in :: libcxx/utilities/expected/expected.expected/value.observers.verify.cpp
  llvm-libc++-shared.cfg.in :: libcxx/utilities/expected/expected.void/and_then.mandates.verify.cpp
  llvm-libc++-shared.cfg.in :: std/containers/sequences/array/array.creation/to_array.verify.cpp
  llvm-libc++-shared.cfg.in :: std/containers/views/mdspan/mdspan/conversion.verify.cpp
  llvm-libc++-shared.cfg.in :: std/utilities/function.objects/func.bind.partial/bind_back.verify.cpp
  llvm-libc++-shared.cfg.in :: std/utilities/function.objects/func.bind_front/bind_front.verify.cpp

The

  llvm-libc++-shared.cfg.in :: libcxx/selftest/dsl/dsl.sh.py

failure happens also before this patch, but the other ones are new.

One example of a failure printout for libcxx/utilities/expected/expected.expected/value.observers.verify.cpp:

# .---command stderr------------
# | error: 'expected-error' diagnostics seen but not expected: 
# |   File /repo/llvm/build-all-builtins/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/libcxx/test-suite-install/include/c++/v1/__expected/expected.h Line 79: call to deleted constructor of 'MoveOnly'
# |   File /repo/llvm/build-all-builtins/runtimes/runtimes-x86_64-unknown-linux-gnu-bins/libcxx/test-suite-install/include/c++/v1/__expected/expected.h Line 79: call to deleted constructor of 'CopyConstructibleButNotMoveConstructible'
# | 2 errors generated.
# `-----------------------------
# error: command failed with exit status: 1

Seen e.g. here: https://lab.llvm.org/buildbot/#/builders/55/builds/12732

Caslyn · 2025-06-13T17:23:03Z

Hi @egorshamshura and @cor3ntin, we are seeing the test failures mentioned in the previous comment in our downstream builders as well.

If a forward-fix can't be produced quickly, could you please revert this change while investigating?

… false. " (#144127) Reverts #143309 Someone needs to go through the libc++ tests and update the diagnostics checks in those tests (ie, i don't believe there was anything wrong with the PR, but it impacts libc++ tests nonetheless

…valuated to false. " (#144127) Reverts llvm/llvm-project#143309 Someone needs to go through the libc++ tests and update the diagnostics checks in those tests (ie, i don't believe there was anything wrong with the PR, but it impacts libc++ tests nonetheless

…lvm#143309) Added explanation why a is constructible evaluated to false. Also fixed problem with ```ExtractTypeTraitFromExpression```. In case ```std::is_xxx_v<>``` with variadic pack it tries to get template argument, but fails in expression ```Arg.getAsType()``` due to ```Arg.getKind() == TemplateArgument::ArgKind::Pack```, but not ```TemplateArgument::ArgKind::Type```.

… false. " (llvm#144127) Reverts llvm#143309 Someone needs to go through the libc++ tests and update the diagnostics checks in those tests (ie, i don't believe there was anything wrong with the PR, but it impacts libc++ tests nonetheless

…lvm#143309) Added explanation why a is constructible evaluated to false. Also fixed problem with ```ExtractTypeTraitFromExpression```. In case ```std::is_xxx_v<>``` with variadic pack it tries to get template argument, but fails in expression ```Arg.getAsType()``` due to ```Arg.getKind() == TemplateArgument::ArgKind::Pack```, but not ```TemplateArgument::ArgKind::Type```.

… false. " (llvm#144127) Reverts llvm#143309 Someone needs to go through the libc++ tests and update the diagnostics checks in those tests (ie, i don't believe there was anything wrong with the PR, but it impacts libc++ tests nonetheless

Fixed problem when std::is_xxx_v<> tries to get Argument as type when…

ed1f379

… it is pack; added is_constructible support

llvmbot added clang Clang issues not falling into any other category clang:frontend Language frontend issues, e.g. anything involving "Sema" labels Jun 8, 2025

egorshamshura mentioned this pull request Jun 8, 2025

[Clang] Explain satisfaction failure for more type traits #141911

Open

cor3ntin reviewed Jun 8, 2025

View reviewed changes

egorshamshura and others added 3 commits June 9, 2025 16:18

Updated DiagnoseNonTriviallyCopyableReason, changed tests to current …

ef79556

…version.

Fixed problems, updated DiagnoseNonConstructibleReason and tests

cb89df9

Merge branch 'main' into explain-is-constructible

bd3cefd

egorshamshura requested a review from cor3ntin June 10, 2025 09:23

Fixed tests

172cee8

egorshamshura requested a review from Endilll as a code owner June 11, 2025 20:44

Endilll reviewed Jun 12, 2025

View reviewed changes

clang/test/CXX/drs/cwg18xx.cpp Outdated Show resolved Hide resolved

cor3ntin reviewed Jun 12, 2025

View reviewed changes

egorshamshura added 2 commits June 12, 2025 12:33

Removed incomplete type check. Added check for incomplete array type …

bd3cfca

…for T. Updated tests.

Changed Baz to cwg1890-Baz in cwg18xx.cpp

bd1e468

egorshamshura requested a review from cor3ntin June 12, 2025 13:44

erichkeane approved these changes Jun 12, 2025

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Fixed some problems, changed behavior on void types, updated test

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erichkeane reviewed Jun 12, 2025

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Added curley brackets, changed assert to llvm_unreachable

e18073b

cor3ntin changed the title ~~[Clang] Added explanation why a is constructible evaluated to false.~~ [Clang] Added explanation why is_constructible evaluated to false. Jun 12, 2025

cor3ntin approved these changes Jun 13, 2025

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cor3ntin merged commit 02b6ed0 into llvm:main Jun 13, 2025
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cor3ntin mentioned this pull request Jun 13, 2025

Revert "[Clang] Added explanation why is_constructible evaluated to false. " #144127

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egorshamshura mentioned this pull request Jun 14, 2025

[libc++][Clang] Added explanation why is_constructible evaluated to false. Updated the diagnostics checks in libc++ tests. #144220

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	if (Arg.getKind() == TemplateArgument::ArgKind::Type)
	else if (Arg.getKind() == TemplateArgument::ArgKind::Type)

	for (const auto &ArgTy : Ts) {
	for (const QualType &ArgTy : Ts) {

[Clang] Added explanation why is_constructible evaluated to false. #143309

[Clang] Added explanation why is_constructible evaluated to false. #143309

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egorshamshura Jun 9, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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[Clang] Added explanation why `is_constructible` evaluated to false. #143309

[Clang] Added explanation why `is_constructible` evaluated to false. #143309

egorshamshura commented Jun 8, 2025 •

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egorshamshura Jun 9, 2025 •

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