From a6b64ca957858c613be57912d68e763331c6f474 Mon Sep 17 00:00:00 2001
From: Joshua Nelson <jyn514@gmail.com>
Date: Thu, 2 Jul 2020 16:23:25 -0400
Subject: [PATCH] Print backtraces for errors

---
 collector/src/bin/rustc-perf-collector/main.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/collector/src/bin/rustc-perf-collector/main.rs b/collector/src/bin/rustc-perf-collector/main.rs
index 0fa1b2d6f..0cdad4fcc 100644
--- a/collector/src/bin/rustc-perf-collector/main.rs
+++ b/collector/src/bin/rustc-perf-collector/main.rs
@@ -331,7 +331,8 @@ fn get_benchmarks(
     exclude: Option<&str>,
 ) -> anyhow::Result<Vec<Benchmark>> {
     let mut benchmarks = Vec::new();
-    'outer: for entry in fs::read_dir(benchmark_dir).context("failed to list benchmarks")? {
+    'outer: for entry in fs::read_dir(benchmark_dir)
+                        .with_context(|| format!("failed to list benchmark dir {}", benchmark_dir.display()))? {
         let entry = entry?;
         let path = entry.path();
         let name = match entry.file_name().into_string() {
@@ -383,7 +384,7 @@ fn main() {
     match main_result() {
         Ok(code) => process::exit(code),
         Err(err) => {
-            eprintln!("{:#}", err);
+            eprintln!("{:#}\n{}", err, err.backtrace());
             process::exit(1);
         }
     }