ilya-biryukov added inline comments.
================
Comment at: clang/lib/Sema/SemaTemplateInstantiate.cpp:1367
+ if (E->getBody()->isDependentContext()) {
+ Sema::SFINAETrap Trap(SemaRef);
+ // We recreate the RequiresExpr body, but not by instantiating it.
----------------
Other uses of `PerformDependentDiagnostics` do not add an explicit `SFINAETrap`
AFAICS.
Why is `RequiresExpr` special? Because it should "eat" the errors and only
return a value?
================
Comment at: clang/lib/Sema/SemaTemplateInstantiate.cpp:1374
+ }
LocalInstantiationScope Scope(SemaRef, /*CombineWithOuterScope=*/true);
return inherited::TransformRequiresExpr(E);
----------------
Other uses of `PerformDependentDiagnostics` happen inside
`LocalInstantiationScope` and after substitution of inner parts.
I suggest following this pattern and moving the added code after the call to
`inherited::TransformRequiresExpr`.
I do not have any concrete examples where the current approach fails, but it's
better to have a single mode of operation across all opeartions.
================
Comment at:
clang/test/CXX/expr/expr.prim/expr.prim.req/simple-requirement.cpp:157
+static_assert(A<0>::faz());
+}
----------------
Could you add a check that in the following case we mention access check in the
note to the `no matching function to call` error?
```
template <class T> struct Use;
class X { int a; friend struct Use<short>; };
template <class T> struct Use {
static void foo() requires (requires (X x) { x.a; }) {
}
};
void test() {
Use<int>::foo();
}
```
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D140547/new/
https://reviews.llvm.org/D140547
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