sys: slighly improve diagnostics for incorrect syscall descriptions

2 files changed, 10 insertions, 2 deletions

diff --git a/sys/align.go b/sys/align.go
index 9d7bb1f06..fdcbb5444 100644
--- a/sys/align.go
+++ b/sys/align.go
@@ -3,6 +3,10 @@
 
 package sys
 
+import (
+	"fmt"
+)
+
 func initAlign() {
 	var rec func(t Type) Type
 	rec = func(t Type) Type {
@@ -22,7 +26,7 @@ func initAlign() {
 			opts := make(map[string]bool)
 			for i, opt := range t1.Options {
 				if opts[opt.Name()] {
-					panic("duplicate option in union")
+					panic(fmt.Sprintf("duplicate option %v in union %v", opt.Name(), t.Name()))
 				}
 				opts[opt.Name()] = true
 				t1.Options[i] = rec(opt)
diff --git a/sys/decl.go b/sys/decl.go
index 29539df11..0705f0629 100644
--- a/sys/decl.go
+++ b/sys/decl.go
@@ -3,6 +3,10 @@
 
 package sys
 
+import (
+	"fmt"
+)
+
 const ptrSize = 8
 
 type Call struct {
@@ -293,7 +297,7 @@ func (t BufferType) Size() uintptr {
 	case BufferAlgName:
 		return 64
 	default:
-		panic("buffer size is not statically known")
+		panic(fmt.Sprintf("buffer size is not statically known: %v", t.Name()))
 	}
 }