s := s.(*ast.TypeSpec)
			n := refName[&s.Type]
			if n != nil && n.Mangle != "" {
				override[n.Mangle] = s.Name.Name
			}
		}
	}

	// Extend overrides using typedefs:
	// If we know that C.xxx should format as T
	// and xxx is a typedef for yyy, make C.yyy format as T.
	for typ, def := range typedef {
		if new := override[typ]; new != "" {
			if id, ok := def.Go.(*ast.Ident); ok {
				override[id.Name] = new
			}
		}
	}

	var _C_zero *C.mpz_t

and then replacing all instances of C.zero with (*_C_zero).

Cgo's most interesting translation is for functions.  If xxx is a C
function, then cgo rewrites C.xxx into a new function _C_xxx that
calls the C xxx in a standard pthread.  The new function translates
its arguments, calls xxx, and translates the return value.

Translation of parameters and the return value follows the type

			args:             strings.Split("log details-v1-5b7f94f9bc-wp5tb --level xxx", " "),
			expectedString:   "unrecognized logging level: xxx",
			wantException:    true,
		},
		{ // logger name invalid
			execClientConfig: loggingConfig,
			args:             strings.Split("log details-v1-5b7f94f9bc-wp5tb --level xxx:debug", " "),
			expectedString:   "unrecognized logger name: xxx",
			wantException:    true,
		},