From de25048a23bbec9ee0dc2f9485e45514444a0d42 Mon Sep 17 00:00:00 2001
From: Jane Lusby <jlusby@yaah.dev>
Date: Mon, 10 Feb 2020 17:42:04 -0800
Subject: [PATCH] add nice alt fmt for debug

---
 src/libstd/backtrace.rs | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/libstd/backtrace.rs b/src/libstd/backtrace.rs
index d481f227db7..7ca7ab674ba 100644
--- a/src/libstd/backtrace.rs
+++ b/src/libstd/backtrace.rs
@@ -186,23 +186,23 @@ fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
 
 impl fmt::Debug for BacktraceSymbol {
     fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
-        let mut dbg = fmt.debug_map();
+        write!(fmt, "{{ ")?;
 
         if let Some(fn_name) = self.name.as_ref().map(|b| backtrace::SymbolName::new(b)) {
-            dbg.entry(&"fn", &format_args!("\"{}\"", fn_name));
+            write!(fmt, "fn: \"{:?}\"", fn_name)?;
         } else {
-            dbg.entry(&"fn", &"<unknown>");
+            write!(fmt, "fn: \"<unknown>\"")?;
         }
 
         if let Some(fname) = self.filename.as_ref() {
-            dbg.entry(&"file", fname);
+            write!(fmt, ", file: {:?}", fname)?;
         }
 
         if let Some(line) = self.lineno.as_ref() {
-            dbg.entry(&"line", line);
+            write!(fmt, ", line: {:?}", line)?;
         }
 
-        dbg.finish()
+        write!(fmt, " }}")
     }
 }
 
-- 
2.44.0