Merge pull request #9915 from 9999years/evaluating-attribute-position

Add position information to `while evaluating the attribute` errors in the debugger

(cherry picked from commit ffe67c86a8ef3695e5c8b9c9800c192ac633dded)
Change-Id: I177ea5ec60898abe09fb9d80d9602b2a32ff8f44

src/libexpr/eval.cc

@@ -1457,7 +1457,7 @@ void ExprSelect::eval(EvalState & state, Env & env, Value & v)
                 state,
                 *this,
                 env,
-                state.positions[pos2],
+                state.positions[getPos()],
                 "while evaluating the attribute '%1%'",
                 showAttrPath(state, env, attrPath))
             : nullptr;