diff options
Diffstat (limited to 'prog')
| -rw-r--r-- | prog/clone.go | 4 | ||||
| -rw-r--r-- | prog/prog.go | 3 |
2 files changed, 7 insertions, 0 deletions
diff --git a/prog/clone.go b/prog/clone.go index 029cf94c4..4523be0eb 100644 --- a/prog/clone.go +++ b/prog/clone.go @@ -39,6 +39,10 @@ func cloneCall(c *Call, newargs map[*ResultArg]*ResultArg) *Call { return c1 } +func CloneArg(arg Arg) Arg { + return clone(arg, nil) +} + func clone(arg Arg, newargs map[*ResultArg]*ResultArg) Arg { var arg1 Arg switch a := arg.(type) { diff --git a/prog/prog.go b/prog/prog.go index f93293b64..da6f158bc 100644 --- a/prog/prog.go +++ b/prog/prog.go @@ -354,6 +354,9 @@ func (p *Prog) insertBefore(c *Call, calls []*Call) { // replaceArg replaces arg with arg1 in a program. func replaceArg(arg, arg1 Arg) { + if arg == arg1 { + panic("replacing an argument with itself") + } switch a := arg.(type) { case *ConstArg: *a = *arg1.(*ConstArg) |