Index: clang/docs/ReleaseNotes.rst
===================================================================
--- clang/docs/ReleaseNotes.rst
+++ clang/docs/ReleaseNotes.rst
@@ -463,6 +463,10 @@
 - Fix crash when passing a braced initializer list to a parentehsized aggregate
   initialization expression.
   (`#63008 <https://github.com/llvm/llvm-project/issues/63008>`_).
+- Fix C++17 mode assert when parsing malformed code and the compiler is
+  attempting to see if it could be type template for class template argument
+  deduction. This fixes
+  (`Issue 57495 <https://github.com/llvm/llvm-project/issues/57495>`_).
 
 Bug Fixes to Compiler Builtins
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Index: clang/lib/Parse/ParseTentative.cpp
===================================================================
--- clang/lib/Parse/ParseTentative.cpp
+++ clang/lib/Parse/ParseTentative.cpp
@@ -1651,7 +1651,8 @@
             if (getLangOpts().CPlusPlus17) {
               if (TryAnnotateTypeOrScopeToken())
                 return TPResult::Error;
-              if (Tok.isNot(tok::identifier))
+              // If we annotated then the current token should not still be ::
+              if (Tok.isNot(tok::annot_cxxscope))
                 break;
             }
 
Index: clang/test/Parser/cxx1z-class-template-argument-deduction.cpp
===================================================================
--- clang/test/Parser/cxx1z-class-template-argument-deduction.cpp
+++ clang/test/Parser/cxx1z-class-template-argument-deduction.cpp
@@ -247,3 +247,11 @@
 };
 
 }
+
+namespace GH57495 {
+template <typename T> struct vector{};
+
+void f() {
+  GH57495::vector.d; // expected-error {{cannot use dot operator on a type}}
+}
+}