diff --git a/dylib/xmake.lua b/dylib/xmake.lua
index f761114e..dafc3a18 100644
--- a/dylib/xmake.lua
+++ b/dylib/xmake.lua
@@ -1,6 +1,6 @@
 add_rules("mode.debug", "mode.release")
 
-set_languages("c11", "c++17")
+set_languages("c11")
 
 root_dir = "../"
 
@@ -10,7 +10,7 @@ add_includedirs(root_dir .. "include")
 -- Define the shared library target for pocketpy
 target("pocketpy")
     set_kind("shared")
-    add_files(root_dir .. "src2/pocketpy_c.cpp")
+    add_files(root_dir .. "src2/pocketpy_c.c")
 
 -- Define the shared library target
 target("test")
diff --git a/include/pocketpy/opcodes.h b/include/pocketpy/opcodes.h
index c04d7c96..0de0e080 100644
--- a/include/pocketpy/opcodes.h
+++ b/include/pocketpy/opcodes.h
@@ -88,6 +88,7 @@ OPCODE(LOOP_CONTINUE)
 OPCODE(LOOP_BREAK)
 OPCODE(GOTO)
 /**************************/
+OPCODE(EVAL)
 OPCODE(CALL)
 OPCODE(CALL_TP)
 OPCODE(RETURN_VALUE)
diff --git a/src/ceval.cpp b/src/ceval.cpp
index 5657fb33..9fce2eb3 100644
--- a/src/ceval.cpp
+++ b/src/ceval.cpp
@@ -499,6 +499,11 @@ __NEXT_STEP:;
         frame->jump_abs_break(index);
     } DISPATCH();
     /*****************************************/
+    TARGET(EVAL){
+        DEF_SNAME(eval);
+        _0 = builtins->attr(eval);
+        TOP() = call(_0, TOP());
+    } DISPATCH();
     TARGET(CALL)
         _0 = vectorcall(
             byte.arg & 0xFFFF,          // ARGC
diff --git a/src/expr.cpp b/src/expr.cpp
index 029089fe..301a1658 100644
--- a/src/expr.cpp
+++ b/src/expr.cpp
@@ -344,15 +344,22 @@ namespace pkpy{
 
 
     void FStringExpr::_load_simple_expr(CodeEmitContext* ctx, Str expr){
-        // TODO: pre compile this into a function
-        int dot = expr.index(".");
-        if(dot < 0){
-            ctx->emit(OP_LOAD_NAME, StrName(expr.sv()).index, line);
+        // name or name.name
+        std::regex pattern(R"(^[a-zA-Z_][a-zA-Z0-9_]*(\.[a-zA-Z_][a-zA-Z0-9_]*){0,1}$)");
+        if(std::regex_match(expr.str(), pattern)){
+            int dot = expr.index(".");
+            if(dot < 0){
+                ctx->emit(OP_LOAD_NAME, StrName(expr.sv()).index, line);
+            }else{
+                StrName name(expr.substr(0, dot).sv());
+                StrName attr(expr.substr(dot+1).sv());
+                ctx->emit(OP_LOAD_NAME, name.index, line);
+                ctx->emit(OP_LOAD_ATTR, attr.index, line);
+            }
         }else{
-            StrName name(expr.substr(0, dot).sv());
-            StrName attr(expr.substr(dot+1).sv());
-            ctx->emit(OP_LOAD_NAME, name.index, line);
-            ctx->emit(OP_LOAD_ATTR, attr.index, line);
+            int index = ctx->add_const(py_var(ctx->vm, expr));
+            ctx->emit(OP_LOAD_CONST, index, line);
+            ctx->emit(OP_EVAL, BC_NOARG, line);
         }
     }
 
diff --git a/src2/pocketpy_c.cpp b/src2/pocketpy_c.c
similarity index 100%
rename from src2/pocketpy_c.cpp
rename to src2/pocketpy_c.c
diff --git a/tests/25_rawstring.py b/tests/25_rawstring.py
index 6c889892..8b5d526c 100644
--- a/tests/25_rawstring.py
+++ b/tests/25_rawstring.py
@@ -57,3 +57,7 @@ assert f'{obj.b:10}' == '123       '
 assert f'{obj.b:>10}' == '       123'
 assert f'{obj.b:1}' == '123'
 assert f'{obj.b:10s}' == '123       '
+
+a = [(1,2), 3, obj]
+assert f'{a[0][1]}' == '2'
+assert f'abc{a[-1].b:10}==={1234}' == 'abc123       ===1234'
\ No newline at end of file