[Clang][RFC] Do not eat SFINAE diagnostics for explicit template arguments #139066
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@llvm/pr-subscribers-clang-modules @llvm/pr-subscribers-clang Author: Younan Zhang (zyn0217) ChangesInstead of merely suggesting the template arguments are invalid, we now provide an explanation of why the explicit template argument is invalid, following the last diagnostic note. For example, template<int*>
void f();
void g() {
f<42>();
}We now have diagnostics
But don't explain why the 1st is invalid. With this patch, we will have an additional note
Full diff: https://github.com/llvm/llvm-project/pull/139066.diff 18 Files Affected:
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@llvm/pr-subscribers-clang-modules Author: Younan Zhang (zyn0217) ChangesInstead of merely suggesting the template arguments are invalid, we now provide an explanation of why the explicit template argument is invalid, following the last diagnostic note. For example, template<int*>
void f();
void g() {
f<42>();
}We now have diagnostics
But don't explain why the 1st is invalid. With this patch, we will have an additional note
Full diff: https://github.com/llvm/llvm-project/pull/139066.diff 18 Files Affected:
diff --git a/clang/lib/Sema/SemaOverload.cpp b/clang/lib/Sema/SemaOverload.cpp
index 5b224b6c08fef..1b714aee02e67 100644
--- a/clang/lib/Sema/SemaOverload.cpp
+++ b/clang/lib/Sema/SemaOverload.cpp
@@ -751,6 +751,12 @@ clang::MakeDeductionFailureInfo(ASTContext &Context,
case TemplateDeductionResult::Incomplete:
case TemplateDeductionResult::InvalidExplicitArguments:
Result.Data = Info.Param.getOpaqueValue();
+ if (Info.hasSFINAEDiagnostic()) {
+ PartialDiagnosticAt *Diag = new (Result.Diagnostic) PartialDiagnosticAt(
+ SourceLocation(), PartialDiagnostic::NullDiagnostic());
+ Info.takeSFINAEDiagnostic(*Diag);
+ Result.HasDiagnostic = true;
+ }
break;
case TemplateDeductionResult::DeducedMismatch:
@@ -822,7 +828,6 @@ void DeductionFailureInfo::Destroy() {
case TemplateDeductionResult::Incomplete:
case TemplateDeductionResult::TooManyArguments:
case TemplateDeductionResult::TooFewArguments:
- case TemplateDeductionResult::InvalidExplicitArguments:
case TemplateDeductionResult::CUDATargetMismatch:
case TemplateDeductionResult::NonDependentConversionFailure:
break;
@@ -837,6 +842,7 @@ void DeductionFailureInfo::Destroy() {
Data = nullptr;
break;
+ case TemplateDeductionResult::InvalidExplicitArguments:
case TemplateDeductionResult::SubstitutionFailure:
// FIXME: Destroy the template argument list?
Data = nullptr;
@@ -12166,6 +12172,15 @@ static void DiagnoseBadDeduction(Sema &S, NamedDecl *Found, Decl *Templated,
diag::note_ovl_candidate_explicit_arg_mismatch_unnamed)
<< (index + 1);
}
+
+ if (PartialDiagnosticAt *PDiag = DeductionFailure.getSFINAEDiagnostic()) {
+ unsigned DiagID =
+ S.getDiagnostics().getCustomDiagID(DiagnosticsEngine::Note, "%0");
+ SmallString<128> SFINAEArgString;
+ PDiag->second.EmitToString(S.getDiagnostics(), SFINAEArgString);
+ S.Diag(Templated->getLocation(), DiagID) << SFINAEArgString;
+ }
+
MaybeEmitInheritedConstructorNote(S, Found);
return;
diff --git a/clang/test/AST/ByteCode/builtin-align-cxx.cpp b/clang/test/AST/ByteCode/builtin-align-cxx.cpp
index a1edf307d6c47..973fd1b620525 100644
--- a/clang/test/AST/ByteCode/builtin-align-cxx.cpp
+++ b/clang/test/AST/ByteCode/builtin-align-cxx.cpp
@@ -4,7 +4,8 @@
// Check that we don't crash when using dependent types in __builtin_align:
template <typename a, a b>
-void *c(void *d) { // both-note{{candidate template ignored}}
+void *c(void *d) { // both-note{{candidate template ignored}} \
+// both-note {{a non-type template parameter cannot have type 'struct x' before C++20}}
return __builtin_align_down(d, b);
}
diff --git a/clang/test/AST/ByteCode/cxx20.cpp b/clang/test/AST/ByteCode/cxx20.cpp
index 42e6ae33e92e4..1625f8eee8425 100644
--- a/clang/test/AST/ByteCode/cxx20.cpp
+++ b/clang/test/AST/ByteCode/cxx20.cpp
@@ -753,7 +753,8 @@ namespace FailingDestructor {
}
};
template<D d>
- void f() {} // both-note {{invalid explicitly-specified argument}}
+ void f() {} // both-note {{invalid explicitly-specified argument}} \
+ // both-note {{non-type template argument is not a constant expression}}
void g() {
f<D{0, false}>(); // both-error {{no matching function}}
diff --git a/clang/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p12.cpp b/clang/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p12.cpp
index f12e0083fb0c9..ee38418acfb32 100644
--- a/clang/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p12.cpp
+++ b/clang/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p12.cpp
@@ -113,21 +113,25 @@ namespace test3 {
struct Derived1 : Base {
using Base::foo;
- template <int n> Opaque<2> foo() { return Opaque<2>(); } // expected-note {{invalid explicitly-specified argument for template parameter 'n'}}
+ template <int n> Opaque<2> foo() { return Opaque<2>(); } // expected-note {{invalid explicitly-specified argument for template parameter 'n'}} \
+ // expected-note {{template argument for non-type template parameter must be an expression}}
};
struct Derived2 : Base {
- template <int n> Opaque<2> foo() { return Opaque<2>(); } // expected-note {{invalid explicitly-specified argument for template parameter 'n'}}
+ template <int n> Opaque<2> foo() { return Opaque<2>(); } // expected-note {{invalid explicitly-specified argument for template parameter 'n'}} \
+ // expected-note {{template argument for non-type template parameter must be an expression}}
using Base::foo;
};
struct Derived3 : Base {
using Base::foo;
- template <class T> Opaque<3> foo() { return Opaque<3>(); } // expected-note {{invalid explicitly-specified argument for template parameter 'T'}}
+ template <class T> Opaque<3> foo() { return Opaque<3>(); } // expected-note {{invalid explicitly-specified argument for template parameter 'T'}} \
+ // expected-note {{template argument for template type parameter must be a type}}
};
struct Derived4 : Base {
- template <class T> Opaque<3> foo() { return Opaque<3>(); } // expected-note {{invalid explicitly-specified argument for template parameter 'T'}}
+ template <class T> Opaque<3> foo() { return Opaque<3>(); } // expected-note {{invalid explicitly-specified argument for template parameter 'T'}} \
+ // expected-note {{template argument for template type parameter must be a type}}
using Base::foo;
};
diff --git a/clang/test/CXX/drs/cwg2xx.cpp b/clang/test/CXX/drs/cwg2xx.cpp
index b2ae8f88ead74..604a60c9fa0c9 100644
--- a/clang/test/CXX/drs/cwg2xx.cpp
+++ b/clang/test/CXX/drs/cwg2xx.cpp
@@ -650,14 +650,17 @@ namespace cwg241 { // cwg241: 9
C::f<3>(b);
// expected-error@-1 {{no matching function for call to 'f'}}
// expected-note@#cwg241-C-f {{candidate template ignored: invalid explicitly-specified argument for template parameter 'T'}}
+ // expected-note@#cwg241-C-f {{template argument for template type parameter must be a type}}
C::g<3>(b);
// expected-error@-1 {{no matching function for call to 'g'}}
// expected-note@#cwg241-C-g {{candidate template ignored: invalid explicitly-specified argument for template parameter 'T'}}
+ // expected-note@#cwg241-C-g {{template argument for template type parameter must be a type}}
using C::f;
using C::g;
f<3>(b);
// expected-error@-1 {{no matching function for call to 'f'}}
// expected-note@#cwg241-C-f {{candidate template ignored: invalid explicitly-specified argument for template parameter 'T'}}
+ // expected-note@#cwg241-C-f {{template argument for template type parameter must be a type}}
// expected-note@#cwg241-A-f {{candidate function template not viable: requires 0 arguments, but 1 was provided}}
g<3>(b);
}
@@ -952,6 +955,7 @@ namespace cwg258 { // cwg258: 2.8
int &x = b.g<int>(0);
// expected-error@-1 {{no matching member function for call to 'g'}}
// expected-note@#cwg258-B-g {{candidate template ignored: invalid explicitly-specified argument for 1st template parameter}}
+ // expected-note@#cwg258-B-g {{template argument for non-type template parameter must be an expression}}
int &y = b.h();
float &z = const_cast<const B&>(b).h();
diff --git a/clang/test/CXX/drs/cwg3xx.cpp b/clang/test/CXX/drs/cwg3xx.cpp
index 8b035cf6f2370..b1b8d20187dcb 100644
--- a/clang/test/CXX/drs/cwg3xx.cpp
+++ b/clang/test/CXX/drs/cwg3xx.cpp
@@ -985,7 +985,9 @@ namespace cwg354 { // cwg354: 3.1 c++11
int b1 = both<(int*)0>();
// cxx98-error@-1 {{no matching function for call to 'both'}}
// cxx98-note@#cwg354-both-int-ptr {{candidate template ignored: invalid explicitly-specified argument for 1st template parameter}}
+ // cxx98-note@#cwg354-both-int-ptr {{non-type template argument does not refer to any declaration}}
// cxx98-note@#cwg354-both-int {{candidate template ignored: invalid explicitly-specified argument for 1st template parameter}}
+ // cxx98-note@#cwg354-both-int {{non-type template argument of type 'int *' must have an integral or enumeration type}}
template<int S::*> struct ptr_mem {}; // #cwg354-ptr_mem
ptr_mem<0> m0; // #cwg354-m0
diff --git a/clang/test/CXX/expr/expr.const/p3-0x.cpp b/clang/test/CXX/expr/expr.const/p3-0x.cpp
index 3eedef3cf7712..c7dafc59599dd 100644
--- a/clang/test/CXX/expr/expr.const/p3-0x.cpp
+++ b/clang/test/CXX/expr/expr.const/p3-0x.cpp
@@ -107,7 +107,8 @@ void c() {
break;
}
}
-template <bool B> int f() { return B; } // expected-note {{candidate template ignored: invalid explicitly-specified argument for template parameter 'B'}}
+template <bool B> int f() { return B; } // expected-note {{candidate template ignored: invalid explicitly-specified argument for template parameter 'B'}} \
+// expected-note {{conversion from 'int (S::*)() const' to 'bool' is not allowed in a converted constant expression}}
template int f<&S::operator int>(); // expected-error {{does not refer to a function template}}
template int f<(bool)&S::operator int>();
diff --git a/clang/test/CXX/temp/temp.param/p8-cxx20.cpp b/clang/test/CXX/temp/temp.param/p8-cxx20.cpp
index a3478c0669661..953b613eeef4a 100644
--- a/clang/test/CXX/temp/temp.param/p8-cxx20.cpp
+++ b/clang/test/CXX/temp/temp.param/p8-cxx20.cpp
@@ -40,7 +40,8 @@ namespace ConstDestruction {
};
template<D d>
- void f() {} // expected-note 2{{invalid explicitly-specified argument}}
+ void f() {} // expected-note 2{{invalid explicitly-specified argument}} \
+ // expected-note 2{{non-type template argument is not a constant expression}}
void g() {
f<D{0, true}>();
diff --git a/clang/test/CXX/temp/temp.res/temp.local/p1.cpp b/clang/test/CXX/temp/temp.res/temp.local/p1.cpp
index faa85cb5fce30..8a49fc39e2d2b 100644
--- a/clang/test/CXX/temp/temp.res/temp.local/p1.cpp
+++ b/clang/test/CXX/temp/temp.res/temp.local/p1.cpp
@@ -10,9 +10,11 @@ template<typename> char id;
template<typename> struct TempType {};
template<template<typename> class> struct TempTemp {};
-template<typename> void use(int&); // expected-note {{invalid explicitly-specified argument}} expected-note {{no known conversion}}
+template<typename> void use(int&); // expected-note {{invalid explicitly-specified argument}} expected-note {{no known conversion}} \
+// expected-note {{use of class template 'B::template C' requires template arguments}}
template<template<typename> class> void use(float&); // expected-note 2{{no known conversion}}
-template<int> void use(char&); // expected-note 2{{invalid explicitly-specified argument}}
+template<int> void use(char&); // expected-note 2{{invalid explicitly-specified argument}} \
+// expected-note 2{{template argument for non-type template parameter must be an expression}}
template<typename T> struct A {
template<typename> struct C {};
diff --git a/clang/test/Modules/cxx-templates.cpp b/clang/test/Modules/cxx-templates.cpp
index f587af4beb7ce..dce93f866b15c 100644
--- a/clang/test/Modules/cxx-templates.cpp
+++ b/clang/test/Modules/cxx-templates.cpp
@@ -43,11 +43,13 @@ void g() {
template_param_kinds_2<Tmpl_T_C>(); // expected-error {{no matching function for call}}
// expected-note@Inputs/cxx-templates-a.h:11 {{candidate}}
+ // expected-note@Inputs/cxx-templates-a.h:11 {{too many template arguments for class template 'Tmpl_T_C'}}
// expected-note@Inputs/cxx-templates-b.h:11 {{candidate}}
template_param_kinds_2<Tmpl_T_I_I>(); // expected-error {{ambiguous}}
// expected-note@Inputs/cxx-templates-a.h:11 {{candidate}}
// expected-note@Inputs/cxx-templates-b.h:11 {{candidate}}
+ // expected-note@Inputs/cxx-templates-b.h:11 {{non-type parameter of template template parameter cannot be narrowed from type 'int' to 'char'}}
template_param_kinds_3<Tmpl_T_T_A>();
template_param_kinds_3<Tmpl_T_T_B>();
diff --git a/clang/test/SemaCXX/builtin-align-cxx.cpp b/clang/test/SemaCXX/builtin-align-cxx.cpp
index d18bc2bf66551..a680ac2aaa763 100644
--- a/clang/test/SemaCXX/builtin-align-cxx.cpp
+++ b/clang/test/SemaCXX/builtin-align-cxx.cpp
@@ -3,7 +3,8 @@
// Check that we don't crash when using dependent types in __builtin_align:
template <typename a, a b>
-void *c(void *d) { // expected-note{{candidate template ignored}}
+void *c(void *d) { // expected-note{{candidate template ignored}} \
+// expected-note {{a non-type template parameter cannot have type 'struct x' before C++20}}
return __builtin_align_down(d, b);
}
diff --git a/clang/test/SemaCXX/calling-conv-compat.cpp b/clang/test/SemaCXX/calling-conv-compat.cpp
index 9bb448ffef225..8e67528717c5b 100644
--- a/clang/test/SemaCXX/calling-conv-compat.cpp
+++ b/clang/test/SemaCXX/calling-conv-compat.cpp
@@ -425,6 +425,7 @@ namespace D50526 {
void h() { g<void, h>(); }
#if !_M_X64
// expected-error@-2 {{no matching function for call to}}
- // expected-note@-4 {{invalid explicitly-specified argument}}
+ // expected-note@-4 {{invalid explicitly-specified argument}} \
+ // expected-note@-4 {{non-type template argument of type 'void ()' cannot be converted to a value of type 'void (*)() __attribute__((stdcall))'}}
#endif
}
diff --git a/clang/test/SemaCXX/constexpr-function-recovery-crash.cpp b/clang/test/SemaCXX/constexpr-function-recovery-crash.cpp
index 90ee7892b2fc2..086bfa15fe0ea 100644
--- a/clang/test/SemaCXX/constexpr-function-recovery-crash.cpp
+++ b/clang/test/SemaCXX/constexpr-function-recovery-crash.cpp
@@ -60,7 +60,8 @@ constexpr void test8() {
throw "bad";
}
-template<int x> constexpr int f(int y) { // expected-note {{candidate template ignored}}
+template<int x> constexpr int f(int y) { // expected-note {{candidate template ignored}} \
+ // expected-note {{non-type template argument is not a constant expression}}
return x * y;
}
constexpr int test9(int x) {
diff --git a/clang/test/SemaCXX/cxx2a-template-lambdas.cpp b/clang/test/SemaCXX/cxx2a-template-lambdas.cpp
index 00ba291fbd198..413bf7cd09667 100644
--- a/clang/test/SemaCXX/cxx2a-template-lambdas.cpp
+++ b/clang/test/SemaCXX/cxx2a-template-lambdas.cpp
@@ -1,8 +1,8 @@
// RUN: %clang_cc1 -std=c++03 -verify -Dstatic_assert=_Static_assert -Wno-c++11-extensions -Wno-c++14-extensions -Wno-c++17-extensions -Wno-c++20-extensions %s
// RUN: %clang_cc1 -std=c++11 -verify=expected,cxx11,cxx11-cxx14 -Wno-c++20-extensions -Wno-c++17-extensions -Wno-c++14-extensions %s
// RUN: %clang_cc1 -std=c++14 -verify=expected,cxx11-cxx14,cxx14 -Wno-c++20-extensions -Wno-c++17-extensions %s
-// RUN: %clang_cc1 -std=c++17 -verify -Wno-c++20-extensions %s
-// RUN: %clang_cc1 -std=c++20 -verify %s
+// RUN: %clang_cc1 -std=c++17 -verify=expected,cxx17,cxx17-cxx20 -Wno-c++20-extensions %s
+// RUN: %clang_cc1 -std=c++20 -verify=expected,cxx20,cxx17-cxx20 %s
template<typename, typename>
inline const bool is_same = false;
@@ -47,6 +47,8 @@ constexpr T outer() {
return []<T x>() { return x; }.template operator()<123>(); // expected-error {{no matching member function}} \
expected-note {{candidate template ignored}} \
cxx11-note {{non-literal type '<dependent type>' cannot be used in a constant expression}} \
+ cxx11-cxx14-note {{non-type template argument does not refer to any declaration}} \
+ cxx17-cxx20-note {{value of type 'int' is not implicitly convertible to 'int *'}} \
cxx14-note {{non-literal type}}
}
static_assert(outer<int>() == 123); // cxx11-cxx14-error {{not an integral constant expression}} cxx11-cxx14-note {{in call}}
diff --git a/clang/test/SemaCXX/typo-correction.cpp b/clang/test/SemaCXX/typo-correction.cpp
index 45f42c4260358..c25d01eade890 100644
--- a/clang/test/SemaCXX/typo-correction.cpp
+++ b/clang/test/SemaCXX/typo-correction.cpp
@@ -614,7 +614,8 @@ int bar() {
namespace testIncludeTypeInTemplateArgument {
template <typename T, typename U>
-void foo(T t = {}, U = {}); // expected-note {{candidate template ignored}}
+void foo(T t = {}, U = {}); // expected-note {{candidate template ignored}} \
+ // expected-note {{template argument for template type parameter must be a type}}
class AddObservation {}; // expected-note {{declared here}}
int bar1() {
diff --git a/clang/test/SemaTemplate/concepts-using-decl.cpp b/clang/test/SemaTemplate/concepts-using-decl.cpp
index fca69dea5c88f..cad160fd585c0 100644
--- a/clang/test/SemaTemplate/concepts-using-decl.cpp
+++ b/clang/test/SemaTemplate/concepts-using-decl.cpp
@@ -165,8 +165,10 @@ struct base {
struct bar : public base {
using base::foo;
- template <int N>
- int foo() { return 2; }; // expected-note {{candidate template ignored: substitution failure: too many template arguments for function template 'foo'}}
+ template <int N>
+ int foo() { return 2; };
+ // expected-note@-1 {{candidate template ignored: invalid explicitly-specified argument for template parameter 'N'}} \
+ // expected-note@-1 {{too many template arguments for function template 'foo'}}
};
void func() {
diff --git a/clang/test/SemaTemplate/overload-candidates.cpp b/clang/test/SemaTemplate/overload-candidates.cpp
index de998d74f9af6..25f0492a71729 100644
--- a/clang/test/SemaTemplate/overload-candidates.cpp
+++ b/clang/test/SemaTemplate/overload-candidates.cpp
@@ -16,10 +16,12 @@ void test_dyn_cast(int* ptr) {
(void)dyn_cast(ptr); // expected-error{{no matching function for call to 'dyn_cast'}}
}
-template<int I, typename T>
- void get(const T&); // expected-note{{candidate template ignored: invalid explicitly-specified argument for template parameter 'I'}}
-template<template<class T> class, typename T>
- void get(const T&); // expected-note{{candidate template ignored: invalid explicitly-specified argument for 1st template parameter}}
+template<int I, typename T>
+ void get(const T&); // expected-note{{candidate template ignored: invalid explicitly-specified argument for template parameter 'I'}} \
+ // expected-note {{template argument for non-type template parameter must be an expression}}
+template<template<class T> class, typename T>
+ void get(const T&); // expected-note{{candidate template ignored: invalid explicitly-specified argument for 1st template parameter}} \
+ // expected-note {{template argument for template template parameter must be a class template}}
void test_get(void *ptr) {
get<int>(ptr); // expected-error{{no matching function for call to 'get'}}
diff --git a/clang/test/SemaTemplate/temp_arg_nontype_cxx11.cpp b/clang/test/SemaTemplate/temp_arg_nontype_cxx11.cpp
index 5752cbac0291d..44bc5b7642f76 100644
--- a/clang/test/SemaTemplate/temp_arg_nontype_cxx11.cpp
+++ b/clang/test/SemaTemplate/temp_arg_nontype_cxx11.cpp
@@ -42,8 +42,9 @@ template <int a, unsigned b, int c>
void TempFunc() {}
void Useage() {
- //expected-error@+2 {{no matching function}}
- //expected-note@-4 {{candidate template ignored: invalid explicitly-specified argument for template parameter 'b'}}
+ //expected-error@+3 {{no matching function}}
+ //expected-note@-4 {{candidate template ignored: invalid explicitly-specified argument for template parameter 'b'}} \
+ //expected-note@-4 {{non-type template argument evaluates to -1, which cannot be narrowed to type 'unsigned int'}}
TempFunc<1, -1, 1>();
}
}
|
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| // cxx98-note@#cwg354-both-int {{candidate template ignored: invalid explicitly-specified argument for 1st template parameter}} | ||
| // cxx98-note@#cwg354-both-int {{non-type template argument of type 'int *' must have an integral or enumeration type}} |
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I'm not sure about the enumeration part, because you need two conversions to get from (unscoped) enum to pointer (via integer), and https://eel.is/c++draft/conv#general-1 doesn't seem to allow both in the same standard conversion sequence
erichkeane
reviewed
May 8, 2025
| @@ -12166,6 +12174,15 @@ static void DiagnoseBadDeduction(Sema &S, NamedDecl *Found, Decl *Templated, | |||
| diag::note_ovl_candidate_explicit_arg_mismatch_unnamed) | |||
| << (index + 1); | |||
| } | |||
|
|
|||
| if (PartialDiagnosticAt *PDiag = DeductionFailure.getSFINAEDiagnostic()) { | |||
| unsigned DiagID = | |||
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Why are you going through all this work to emit the string that is already in the partial diagnostic? ALSO, why not use the location in the Partial Diagnostic?
You should be able to do:
S.Diag(PDiag.first, PDiag.second).
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-
Because SFINAE diagnostics basically take the form of errors, I think it's more reasonable to emit them as notes when enumerating failed candidates, to help reduce noise, like how SubstitutionFailure below works.
-
That behavior comes from how we draw squiggle lines: if the next note's location differs from the current one, a new code snippet is introduced. But in this context, we've already printed a source snippet in the "candidate is ..." line, so from my perspective, it's clearer if there's just a single line attached to that.
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#2 makes sense to me.
For #1: It seems to me that a way to 'downgrade' a diagnostic to a note is a better solution here. I dont' really know what that looks like and might require a bit of a trip through the DiagnosticsEngine (@AaronBallman for visibility), but I would vastly prefer that.
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I dont' really know what that looks like and might require a bit of a trip through the DiagnosticsEngine
SGTM. I'll look into it and come back with an answer
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This is obviously a step in the right direction, but bear in mind that this is still limited to a single error, and in some cases it can be hard to understand that error without the notes which follow it.
An alternative here, instead of degrading the level of diagnostic, would be to come up with a way to establish a nesting of diagnostics, beyond what we do implicitly, with notes always attached to the previous non-note diagnostic.
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An alternative here, instead of degrading the level of diagnostic, would be to come up with a way to establish a nesting of diagnostics, beyond what we do implicitly, with notes always attached to the previous non-note diagnostic.
Can you please say more? Our current deduction failure diagnostics are already implemented in the way that note diagnostics (like SFINAE errors) are attached to the error, right?
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Instead of merely suggesting the template arguments are invalid, we now provide an explanation of why the explicit template argument is invalid, following the last diagnostic note.
For example,
We now have diagnostics
But don't explain why the 1st is invalid. With this patch, we will have an additional note