Index: clang-tidy/utils/ExprMutationAnalyzer.cpp
===================================================================
--- clang-tidy/utils/ExprMutationAnalyzer.cpp
+++ clang-tidy/utils/ExprMutationAnalyzer.cpp
@@ -145,11 +145,16 @@
                     hasUnaryOperand(equalsNode(Exp)));
 
   // Invoking non-const member function.
+  // A member function is assumed to be non-const when it is unresolved.
   const auto NonConstMethod = cxxMethodDecl(unless(isConst()));
   const auto AsNonConstThis =
       expr(anyOf(cxxMemberCallExpr(callee(NonConstMethod), on(equalsNode(Exp))),
                  cxxOperatorCallExpr(callee(NonConstMethod),
-                                     hasArgument(0, equalsNode(Exp)))));
+                                     hasArgument(0, equalsNode(Exp))),
+                 callExpr(callee(expr(anyOf(
+                     unresolvedMemberExpr(hasObjectExpression(equalsNode(Exp))),
+                     cxxDependentScopeMemberExpr(
+                         hasObjectExpression(equalsNode(Exp)))))))));
 
   // Taking address of 'Exp'.
   // We're assuming 'Exp' is mutated as soon as its address is taken, though in
@@ -165,10 +170,16 @@
                unless(hasParent(arraySubscriptExpr())), has(equalsNode(Exp)));
 
   // Used as non-const-ref argument when calling a function.
+  // An argument is assumed to be non-const-ref when the function is unresolved.
   const auto NonConstRefParam = forEachArgumentWithParam(
       equalsNode(Exp), parmVarDecl(hasType(nonConstReferenceType())));
-  const auto AsNonConstRefArg =
-      anyOf(callExpr(NonConstRefParam), cxxConstructExpr(NonConstRefParam));
+  const auto AsNonConstRefArg = anyOf(
+      callExpr(NonConstRefParam), cxxConstructExpr(NonConstRefParam),
+      callExpr(callee(expr(anyOf(unresolvedLookupExpr(), unresolvedMemberExpr(),
+                                 cxxDependentScopeMemberExpr(),
+                                 hasType(templateTypeParmType())))),
+               hasAnyArgument(equalsNode(Exp))),
+      cxxUnresolvedConstructExpr(hasAnyArgument(equalsNode(Exp))));
 
   // Captured by a lambda by reference.
   // If we're initializing a capture with 'Exp' directly then we're initializing
@@ -195,9 +206,12 @@
 
 const Stmt *ExprMutationAnalyzer::findMemberMutation(const Expr *Exp) {
   // Check whether any member of 'Exp' is mutated.
-  const auto MemberExprs = match(
-      findAll(memberExpr(hasObjectExpression(equalsNode(Exp))).bind("expr")),
-      *Stm, *Context);
+  const auto MemberExprs =
+      match(findAll(expr(anyOf(memberExpr(hasObjectExpression(equalsNode(Exp))),
+                               cxxDependentScopeMemberExpr(
+                                   hasObjectExpression(equalsNode(Exp)))))
+                        .bind("expr")),
+            *Stm, *Context);
   return findExprMutation(MemberExprs);
 }
 
Index: unittests/clang-tidy/ExprMutationAnalyzerTest.cpp
===================================================================
--- unittests/clang-tidy/ExprMutationAnalyzerTest.cpp
+++ unittests/clang-tidy/ExprMutationAnalyzerTest.cpp
@@ -114,6 +114,26 @@
   EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("x.mf()"));
 }
 
+TEST(ExprMutationAnalyzerTest, AssumedNonConstMemberFunc) {
+  auto AST = tooling::buildASTFromCode(
+      "struct X { template <class T> void mf(); };"
+      "template <class T> void f() { X x; x.mf<T>(); }");
+  auto Results =
+      match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
+  EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("x.mf<T>()"));
+
+  AST =
+      tooling::buildASTFromCode("template <class T> void f() { T x; x.mf(); }");
+  Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
+  EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("x.mf()"));
+
+  AST = tooling::buildASTFromCode(
+      "template <class T> struct X;"
+      "template <class T> void f() { X<T> x; x.mf(); }");
+  Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
+  EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("x.mf()"));
+}
+
 TEST(ExprMutationAnalyzerTest, ConstMemberFunc) {
   const auto AST = tooling::buildASTFromCode(
       "void f() { struct Foo { void mf() const; }; Foo x; x.mf(); }");
@@ -292,6 +312,46 @@
               ElementsAre("std::forward<A &>(x)"));
 }
 
+TEST(ExprMutationAnalyzerTest, CallUnresolved) {
+  auto AST =
+      tooling::buildASTFromCode("template <class T> void f() { T x; g(x); }");
+  auto Results =
+      match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
+  EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("g(x)"));
+
+  AST = tooling::buildASTFromCode(
+      "template <class T> void f(T t) { int x; g(t, x); }");
+  Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
+  EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("g(t, x)"));
+
+  AST = tooling::buildASTFromCode(
+      "template <class T> void f(T t) { int x; t.mf(x); }");
+  Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
+  EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("t.mf(x)"));
+
+  AST = tooling::buildASTFromCode(
+      "template <class T> struct S;"
+      "template <class T> void f() { S<T> s; int x; s.mf(x); }");
+  Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
+  EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("s.mf(x)"));
+
+  AST = tooling::buildASTFromCode(
+      "struct S { template <class T> void mf(); };"
+      "template <class T> void f(S s) { int x; s.mf<T>(x); }");
+  Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
+  EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("s.mf<T>(x)"));
+
+  AST = tooling::buildASTFromCode("template <class F>"
+                                  "void g(F f) { int x; f(x); } ");
+  Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
+  EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("f(x)"));
+
+  AST = tooling::buildASTFromCode(
+      "template <class T> void f() { int x; (void)T(x); }");
+  Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
+  EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("T(x)"));
+}
+
 TEST(ExprMutationAnalyzerTest, ReturnAsValue) {
   const auto AST = tooling::buildASTFromCode("int f() { int x; return x; }");
   const auto Results =
@@ -347,6 +407,21 @@
   EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("x"));
 }
 
+TEST(ExprMutationAnalyzerTest, TemplateWithArrayToPointerDecay) {
+  const auto AST = tooling::buildASTFromCode(
+      "template <typename T> struct S { static constexpr int v = 8; };"
+      "template <> struct S<int> { static constexpr int v = 4; };"
+      "void g(char*);"
+      "template <typename T> void f() { char x[S<T>::v]; g(x); }"
+      "template <> void f<int>() { char y[S<int>::v]; g(y); }");
+  const auto ResultsX =
+      match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
+  EXPECT_THAT(mutatedBy(ResultsX, AST.get()), ElementsAre("g(x)"));
+  const auto ResultsY =
+      match(withEnclosingCompound(declRefTo("y")), AST->getASTContext());
+  EXPECT_THAT(mutatedBy(ResultsY, AST.get()), ElementsAre("y"));
+}
+
 TEST(ExprMutationAnalyzerTest, FollowRefModified) {
   const auto AST = tooling::buildASTFromCode(
       "void f() { int x; int& r0 = x; int& r1 = r0; int& r2 = r1; "
@@ -398,21 +473,43 @@
 }
 
 TEST(ExprMutationAnalyzerTest, NestedMemberModified) {
-  const auto AST = tooling::buildASTFromCode(
+  auto AST = tooling::buildASTFromCode(
       "void f() { struct A { int vi; }; struct B { A va; }; "
       "struct C { B vb; }; C x; x.vb.va.vi = 10; }");
-  const auto Results =
+  auto Results =
       match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
   EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("x.vb.va.vi = 10"));
+
+  AST = tooling::buildASTFromCode(
+      "template <class T> void f() { T x; x.y.z = 10; }");
+  Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
+  EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("x.y.z = 10"));
+
+  AST = tooling::buildASTFromCode(
+      "template <class T> struct S;"
+      "template <class T> void f() { S<T> x; x.y.z = 10; }");
+  Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
+  EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("x.y.z = 10"));
 }
 
 TEST(ExprMutationAnalyzerTest, NestedMemberNotModified) {
-  const auto AST = tooling::buildASTFromCode(
+  auto AST = tooling::buildASTFromCode(
       "void f() { struct A { int vi; }; struct B { A va; }; "
       "struct C { B vb; }; C x; x.vb.va.vi; }");
-  const auto Results =
+  auto Results =
       match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
   EXPECT_FALSE(isMutated(Results, AST.get()));
+
+  AST =
+      tooling::buildASTFromCode("template <class T> void f() { T x; x.y.z; }");
+  Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
+  EXPECT_FALSE(isMutated(Results, AST.get()));
+
+  AST = tooling::buildASTFromCode(
+      "template <class T> struct S;"
+      "template <class T> void f() { S<T> x; x.y.z; }");
+  Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
+  EXPECT_FALSE(isMutated(Results, AST.get()));
 }
 
 TEST(ExprMutationAnalyzerTest, CastToValue) {