From ca6e3752e60236a365110b77a68888cb38571568 Mon Sep 17 00:00:00 2001
From: Martin Odersky <odersky@gmail.com>
Date: Wed, 13 Jan 2021 19:16:33 +0100
Subject: [PATCH] Handle abstract inline methods in TreeUnpickler

Fixes #11075
---
 compiler/src/dotty/tools/dotc/core/tasty/TreeUnpickler.scala | 2 +-
 tests/pos/i11075/A_1.scala                                   | 3 +++
 tests/pos/i11075/B_2.scala                                   | 3 +++
 3 files changed, 7 insertions(+), 1 deletion(-)
 create mode 100644 tests/pos/i11075/A_1.scala
 create mode 100644 tests/pos/i11075/B_2.scala

diff --git a/compiler/src/dotty/tools/dotc/core/tasty/TreeUnpickler.scala b/compiler/src/dotty/tools/dotc/core/tasty/TreeUnpickler.scala
index 1c58ec570f24..c00888444ac2 100644
--- a/compiler/src/dotty/tools/dotc/core/tasty/TreeUnpickler.scala
+++ b/compiler/src/dotty/tools/dotc/core/tasty/TreeUnpickler.scala
@@ -602,7 +602,7 @@ class TreeUnpickler(reader: TastyReader,
         sym.completer.withDecls(newScope)
         forkAt(templateStart).indexTemplateParams()(using localContext(sym))
       }
-      else if (sym.isInlineMethod)
+      else if (sym.isInlineMethod && !sym.is(Deferred))
         sym.addAnnotation(LazyBodyAnnotation { (ctx0: Context) ?=>
           val ctx1 = localContext(sym)(using ctx0).addMode(Mode.ReadPositions)
           inContext(sourceChangeContext(Addr(0))(using ctx1)) {
diff --git a/tests/pos/i11075/A_1.scala b/tests/pos/i11075/A_1.scala
new file mode 100644
index 000000000000..c63b1017e898
--- /dev/null
+++ b/tests/pos/i11075/A_1.scala
@@ -0,0 +1,3 @@
+trait A {
+  inline def a: Int
+}
diff --git a/tests/pos/i11075/B_2.scala b/tests/pos/i11075/B_2.scala
new file mode 100644
index 000000000000..e39a2222dc0f
--- /dev/null
+++ b/tests/pos/i11075/B_2.scala
@@ -0,0 +1,3 @@
+trait B extends A {
+  inline def a: Int = 0
+}