diff --git a/clang/lib/Sema/DeclSpec.cpp b/clang/lib/Sema/DeclSpec.cpp
--- a/clang/lib/Sema/DeclSpec.cpp
+++ b/clang/lib/Sema/DeclSpec.cpp
@@ -1014,9 +1014,6 @@
                                        const char *&PrevSpec, unsigned &DiagID,
                                        ExplicitSpecifier ExplicitSpec,
                                        SourceLocation CloseParenLoc) {
-  assert((ExplicitSpec.getKind() == ExplicitSpecKind::ResolvedTrue ||
-          ExplicitSpec.getExpr()) &&
-         "invalid ExplicitSpecifier");
   // 'explicit explicit' is ok, but warn as this is likely not what the user
   // intended.
   if (hasExplicitSpecifier()) {
diff --git a/clang/test/Misc/explicit.cpp b/clang/test/Misc/explicit.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/Misc/explicit.cpp
@@ -0,0 +1,9 @@
+// RUN: %clang_cc1 -std=c++20 %s -verify
+
+int foo ()  {
+  int b;
+  explicit( && b );  // expected-error{{conversion from 'void *' to 'bool' is not allowed in a converted constant expression}}
+                     // expected-error@-1{{'explicit' can only appear on non-static member functions}}
+                     // expected-error@-2{{use of undeclared label 'b'}}
+                     // expected-warning@-3{{declaration does not declare anything}}
+}