fix inconsistent behavior (#1)

Author: yaahc

Cargo.toml

@@ -18,7 +18,8 @@ color-backtrace = "0.4.0"
 backtrace = "0.3"
 indenter = "0.2.0"
 ansi_term = "0.12.1"
-color-spantrace = { version = "0.1", optional = true }
+color-spantrace = { version = "0.1.1", optional = true }
+
 
 [dev-dependencies]
 tracing-subscriber = "0.2.5"

src/lib.rs

@@ -178,7 +178,10 @@ pub struct Context {
 impl EyreContext for Context {
     #[allow(unused_variables)]
     fn default(error: &(dyn std::error::Error + 'static)) -> Self {
-        let backtrace = if std::env::var("RUST_LIB_BACKTRACE").is_ok() {
+        let backtrace = if std::env::var("RUST_LIB_BACKTRACE")
+            .or_else(|_| std::env::var("RUST_BACKTRACE"))
+            .is_ok()
+        {
             Some(Backtrace::new())
         } else {
             None