runtime: testing runtime

runtime/internal/lib/os/exec/exec.go

@@ -16,7 +16,6 @@
 
 package exec
 
-// llgo:skipall
 import (
 	"bytes"
 	"context"
@@ -33,6 +32,9 @@ import (
 	"github.com/goplus/llgo/runtime/internal/lib/internal/syscall/execenv"
 )
 
+// llgo:skipall
+type _exec struct{}
+
 // Error is returned by LookPath when it fails to classify a file as an
 // executable.
 type Error struct {