From 1f9807799c5f70c3a215698ad6e8eb8a03725969 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Fri, 5 Nov 2021 11:48:28 -0700
Subject: [PATCH] Add test to confirm fnn_unsuffixed does not emit exponent
 notation

---
 src/test/ui/proc-macro/auxiliary/api/parse.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/test/ui/proc-macro/auxiliary/api/parse.rs b/src/test/ui/proc-macro/auxiliary/api/parse.rs
index ef777fc033368..6186b941ef69f 100644
--- a/src/test/ui/proc-macro/auxiliary/api/parse.rs
+++ b/src/test/ui/proc-macro/auxiliary/api/parse.rs
@@ -1,3 +1,5 @@
+// ignore-tidy-linelength
+
 use proc_macro::Literal;
 
 pub fn test() {
@@ -12,6 +14,10 @@ fn test_display_literal() {
     assert_eq!(Literal::f32_suffixed(-10.0).to_string(), "-10f32");
     assert_eq!(Literal::f64_unsuffixed(-10.0).to_string(), "-10.0");
     assert_eq!(Literal::f64_suffixed(-10.0).to_string(), "-10f64");
+    assert_eq!(
+        Literal::f64_unsuffixed(1e100).to_string(),
+        "10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.0",
+    );
 }
 
 fn test_parse_literal() {