Fix #12815 Crash in singleAssignInScope() (#6489)

Author: chrchr-github

Diff for: lib/tokenlist.cpp

@@ -960,7 +960,10 @@ static void compilePrecedence2(Token *&tok, AST_state& state)
                 tok = tok->tokAt(3);
                 break;
             }
-            compileBinOp(tok, state, compileScope);
+            if (!Token::Match(tok->tokAt(-1), "[{,]"))
+                compileBinOp(tok, state, compileScope);
+            else
+                compileUnaryOp(tok, state, compileScope);
         } else if (tok->str() == "[") {
             if (state.cpp && isPrefixUnary(tok, /*cpp*/ true) && Token::Match(tok->link(), "] (|{|<")) { // Lambda
                 // What we do here:

Diff for: test/testtokenize.cpp

@@ -6634,7 +6634,9 @@ class TestTokenizer : public TestFixture {
         ASSERT_EQUALS("double&(4[", testAst("void f(double(&)[4]) {}"));
         ASSERT_EQUALS("voidu*", testAst("int* g ( void* (f) (void*), void* u);")); // #12475
         ASSERT_EQUALS("f::(", testAst("::f();")); // #12544
-        ASSERT_EQUALS("(( (, f ({ (= (. c x) 0))))", testAst("f(c, { .x = 0 });", AstStyle::Z3)); // #12806
+        ASSERT_EQUALS("(( f (, c ({ (= (. x) 0))))", testAst("f(c, { .x = 0 });", AstStyle::Z3)); // #12806
+        ASSERT_EQUALS("(= it (( (. s insert) (, it ({ (, (, (= (. a) i) (= (. b) 2)) (= (. c) 3))))))",
+                      testAst("it = s.insert(it, { .a = i, .b = 2, .c = 3 });", AstStyle::Z3)); // #12815
     }
 
     void asttemplate() { // uninstantiated templates will have <,>,etc..