compiler: always use var_os("RUST_BACKTRACE")

There are 3 instances of var(...) and 3 instances of var_os(...); the
latter avoids an appearance of unhandled error, so use it everywhere.

1 files changed, 1 insertions, 1 deletions

diff --git a/compiler/rustc_codegen_cranelift/build_system/main.rs b/compiler/rustc_codegen_cranelift/build_system/main.rs
index 798ae9dbd50..e8cf486e966 100644
--- a/compiler/rustc_codegen_cranelift/build_system/main.rs
+++ b/compiler/rustc_codegen_cranelift/build_system/main.rs
@@ -55,7 +55,7 @@ enum CodegenBackend {
 }
 
 fn main() {
-    if env::var("RUST_BACKTRACE").is_err() {
+    if env::var_os("RUST_BACKTRACE").is_none() {
         env::set_var("RUST_BACKTRACE", "1");
     }
     env::set_var("CG_CLIF_DISABLE_INCR_CACHE", "1");