From cefbf4d7b57975a7d0e247e2bf3effaf4ec47333 Mon Sep 17 00:00:00 2001
From: Robert Bartlensky <bartlensky.robert@gmail.com>
Date: Thu, 1 Aug 2019 21:07:47 +0100
Subject: [PATCH 1/2] Allow trailing comma in macro 2.0 declarations.

---
 src/libsyntax/ext/tt/macro_rules.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/libsyntax/ext/tt/macro_rules.rs b/src/libsyntax/ext/tt/macro_rules.rs
index 2a2df76d30c1d..81c5ef135b245 100644
--- a/src/libsyntax/ext/tt/macro_rules.rs
+++ b/src/libsyntax/ext/tt/macro_rules.rs
@@ -282,7 +282,10 @@ pub fn compile(
         quoted::TokenTree::Sequence(
             DelimSpan::dummy(),
             Lrc::new(quoted::SequenceRepetition {
-                tts: vec![quoted::TokenTree::token(token::Semi, def.span)],
+                tts: vec![quoted::TokenTree::token(
+                    if body.legacy { token::Semi } else { token::Comma },
+                    def.span,
+                )],
                 separator: None,
                 kleene: quoted::KleeneToken::new(quoted::KleeneOp::ZeroOrMore, def.span),
                 num_captures: 0,

From 2aa368aa0e152435da7f8a7a51d005c50965c860 Mon Sep 17 00:00:00 2001
From: Robert Bartlensky <bartlensky.robert@gmail.com>
Date: Thu, 1 Aug 2019 22:41:10 +0100
Subject: [PATCH 2/2] Add check-pass test for #63102.

---
 src/test/ui/macros/issue-63102.rs | 8 ++++++++
 1 file changed, 8 insertions(+)
 create mode 100644 src/test/ui/macros/issue-63102.rs

diff --git a/src/test/ui/macros/issue-63102.rs b/src/test/ui/macros/issue-63102.rs
new file mode 100644
index 0000000000000..6af5b18680640
--- /dev/null
+++ b/src/test/ui/macros/issue-63102.rs
@@ -0,0 +1,8 @@
+// check-pass
+
+#![feature(decl_macro)]
+macro foo {
+    () => {},
+}
+
+fn main() {}