New upstream version 1.31.0~beta.4+dfsg1

[rustc.git] / src / libstd / build.rs

diff --git a/src/libstd/build.rs b/src/libstd/build.rs
index 0831e29bdddbffe8c4dda533af2266cb881b141d..b3851d22841e8d946fe3c2657d4c0a2136322f4f 100644 (file)
--- a/src/libstd/build.rs
+++ b/src/libstd/build.rs
@@ -97,8 +97,8 @@ fn build_libbacktrace(target: &str) -> Result<(), ()> {
         .file("../libbacktrace/sort.c")
         .file("../libbacktrace/state.c");
 
-    let any_debug = env::var("RUSTC_DEBUGINFO").unwrap_or(String::new()) == "true" ||
-        env::var("RUSTC_DEBUGINFO_LINES").unwrap_or(String::new()) == "true";
+    let any_debug = env::var("RUSTC_DEBUGINFO").unwrap_or_default() == "true" ||
+        env::var("RUSTC_DEBUGINFO_LINES").unwrap_or_default() == "true";
     build.debug(any_debug);
 
     if target.contains("darwin") {