How to make infinite border-radius?

[f1refa11]

tried border-radius: calc(infinity * 1px);(which works in CSS), but LESS showed an error: Could not parse call arguments or missing ')'.

[iChenLei]

.main {
   e("border-radius: calc(infinity * 1px);");
}

or

.main {
   border-radius: e("calc(infinity * 1px)");
}

Try e function as workaround.