From 57a0377c8119b90609045aa6bcb881e2b4f2fc8e Mon Sep 17 00:00:00 2001
From: Evgeniy Stratonikov <evgeniy@nspcc.ru>
Date: Fri, 5 Feb 2021 17:26:26 +0300
Subject: [PATCH] compiler: load `nil` directly on inline

---
 pkg/compiler/codegen.go | 3 +++
 pkg/compiler/inline.go  | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/pkg/compiler/codegen.go b/pkg/compiler/codegen.go
index ea96ef834..a9b62d8cd 100644
--- a/pkg/compiler/codegen.go
+++ b/pkg/compiler/codegen.go
@@ -230,6 +230,9 @@ func (c *codegen) emitLoadVar(pkg string, name string) {
 	if vi.tv.Value != nil {
 		c.emitLoadConst(vi.tv)
 		return
+	} else if vi.index == unspecifiedVarIndex {
+		emit.Opcodes(c.prog.BinWriter, opcode.PUSHNULL)
+		return
 	}
 	c.emitLoadByIndex(vi.refType, vi.index)
 }
diff --git a/pkg/compiler/inline.go b/pkg/compiler/inline.go
index 417e5b857..55e0c8364 100644
--- a/pkg/compiler/inline.go
+++ b/pkg/compiler/inline.go
@@ -41,6 +41,10 @@ func (c *codegen) inlineCall(f *funcScope, n *ast.CallExpr) {
 				c.scope.vars.locals = newScope
 				c.scope.vars.addAlias(name, vi.refType, vi.index, vi.tv)
 				continue
+			} else if arg.Name == "nil" {
+				c.scope.vars.locals = newScope
+				c.scope.vars.addAlias(name, varLocal, unspecifiedVarIndex, types.TypeAndValue{})
+				continue
 			}
 		}
 		ast.Walk(c, n.Args[i])