test: add minimal test to demo amino.MustMarshalJSON panic

Author: tbruyelle

gnovm/pkg/gnolang/values_test.go

@@ -0,0 +1,22 @@
+package gnolang
+
+import (
+	"math/big"
+	"testing"
+
+	"github.com/gnolang/gno/tm2/pkg/amino"
+)
+
+// This test exposes a panics that occurs when BigintValue is embedded
+// in an other struct.
+func TestAminoMustMarshalJSONPanics(t *testing.T) {
+	bi := BigintValue{V: big.NewInt(20)}
+	b := amino.MustMarshalJSON(bi) // works well
+	println(string(b))
+
+	pv := PackageValue{
+		Block: bi,
+	}
+	b = amino.MustMarshalJSON(pv) // panics
+	println(string(b))
+}

gnovm/stdlibs/std/crypto.gno

@@ -6,6 +6,6 @@ func (a Address) String() string {
 	return string(a)
 }
 
-const RawAddressSize = int(20)
+const RawAddressSize = 20
 
 type RawAddress [RawAddressSize]byte