Fix some issues found during a search for another bug

src/core/cfg.cpp

@@ -1058,7 +1058,7 @@ private:
         AST_List* rtn = new AST_List();
         rtn->lineno = node->lineno;
         rtn->col_offset = node->col_offset;
-        rtn->ctx_type == node->ctx_type;
+        rtn->ctx_type = node->ctx_type;
 
         for (auto elt : node->elts) {
             rtn->elts.push_back(remapExpr(elt));
@@ -1104,7 +1104,7 @@ private:
         AST_Tuple* rtn = new AST_Tuple();
         rtn->lineno = node->lineno;
         rtn->col_offset = node->col_offset;
-        rtn->ctx_type == node->ctx_type;
+        rtn->ctx_type = node->ctx_type;
 
         for (auto elt : node->elts) {
             rtn->elts.push_back(remapExpr(elt));

src/runtime/capi.cpp

@@ -1490,7 +1490,7 @@ Box* BoxedCApiFunction::tppCall(Box* _self, CallRewriteArgs* rewrite_args, ArgPa
 
     bool rewrite_success = false;
     rearrangeArguments(paramspec, NULL, self->method_def->ml_name, NULL, rewrite_args, rewrite_success, argspec, arg1,
-                       arg2, arg3, args, keyword_names, oarg1, oarg2, oarg3, args);
+                       arg2, arg3, args, keyword_names, oarg1, oarg2, oarg3, oargs);
 
     if (!rewrite_success)
         rewrite_args = NULL;

src/runtime/descr.cpp

@@ -532,7 +532,7 @@ Box* BoxedWrapperObject::tppCall(Box* _self, CallRewriteArgs* rewrite_args, ArgP
 
     bool rewrite_success = false;
     rearrangeArguments(paramspec, NULL, self->descr->wrapper->name.data(), NULL, rewrite_args, rewrite_success, argspec,
-                       arg1, arg2, arg3, args, keyword_names, oarg1, oarg2, oarg3, args);
+                       arg1, arg2, arg3, args, keyword_names, oarg1, oarg2, oarg3, oargs);
 
     assert(oarg1 && oarg1->cls == tuple_cls);
     if (!paramspec.takes_kwargs)

src/runtime/generator.cpp

@@ -407,7 +407,7 @@ extern "C" void generatorGCHandler(GCVisitor* v, Box* b) {
 
     if (g->running) {
         v->visitPotentialRange((void**)&g->returnContext,
-                               ((void**)&g->returnContext) + sizeof(g->returnContext) / sizeof(void*));
+                               ((void**)&g->returnContext) + sizeof(*g->returnContext) / sizeof(void*));
     } else {
         // g->context is always set for a running generator, but we can trigger a GC while constructing
         // a generator in which case we can see a NULL context