Test for issue 756

Fixes #756

test/issues/756/issue_test.go

@@ -0,0 +1,31 @@
+package issue_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/expr-lang/expr"
+	"github.com/expr-lang/expr/internal/testify/require"
+)
+
+type X struct{}
+
+func (x *X) HelloCtx(ctx context.Context, text string) error {
+	return nil
+}
+
+func TestIssue756(t *testing.T) {
+	env := map[string]any{
+		"_goctx_": context.TODO(),
+		"_g_": map[string]*X{
+			"rpc": {},
+		},
+		"text": "еуче",
+	}
+	exprStr := `let v = _g_.rpc.HelloCtx(text); v`
+	program, err := expr.Compile(exprStr, expr.Env(env), expr.WithContext("_goctx_"))
+	require.NoError(t, err)
+
+	_, err = expr.Run(program, env)
+	require.NoError(t, err)
+}