error duplicate-impl

error Standard: [§10.1]

What it means#

A service has exactly one impl. A second one (or any impl of an extern service) is rejected.

oxl✓ checked in CI

service Twice { rpc ping() -> i32 }
impl Twice { rpc ping() { 1 } }
impl Twice { rpc ping() { 2 } }   // <- duplicate-impl

error

duplicate-impl

Merge the two blocks. An extern service is implemented by another program and has no impl here.