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diff --git a/‎src/cmd/compile/internal/inline/inl.go‎
Lines changed: 2 additions & 0 deletions b/‎src/cmd/compile/internal/inline/inl.go‎
Lines changed: 2 additions & 0 deletions
diff --git a/‎test/fixedbugs/issue45743.go‎
Lines changed: 20 additions & 0 deletions b/‎test/fixedbugs/issue45743.go‎
Lines changed: 20 additions & 0 deletions
@@ -1194,6 +1194,8 @@ func (subst *inlsubst) clovar(n *ir.Name) *ir.Name {
 	case *ir.AssignStmt, *ir.AssignListStmt:
 		// Mark node for reassignment at the end of inlsubst.node.
 		m.Defn = &subst.defnMarker
+	case *ir.TypeSwitchGuard:
+		// TODO(mdempsky): Set m.Defn properly. See discussion on #45743.
 	default:
 		base.FatalfAt(n.Pos(), "unexpected Defn: %+v", defn)
 	}
 
@@ -0,0 +1,20 @@
+// compile
+
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+func fn() func(interface{}) {
+	return func(o interface{}) {
+		switch v := o.(type) {
+		case *int:
+			*v = 1
+		}
+	}
+}
+
+func main() {
+	fn()
+}
Original file line number	Diff line number	Diff line change
`@@ -1194,6 +1194,8 @@ func (subst inlsubst) clovar(n ir.Name) *ir.Name {`
`1194`	`1194`	`case ir.AssignStmt, ir.AssignListStmt:`
`1195`	`1195`	`// Mark node for reassignment at the end of inlsubst.node.`
`1196`	`1196`	`m.Defn = &subst.defnMarker`
	`1197`	`+ case *ir.TypeSwitchGuard:`
	`1198`	`+ // TODO(mdempsky): Set m.Defn properly. See discussion on #45743.`
`1197`	`1199`	`default:`
`1198`	`1200`	`base.FatalfAt(n.Pos(), "unexpected Defn: %+v", defn)`
`1199`	`1201`	`}`