Show actual Tera source error

components/errors/src/lib.rs

@@ -29,7 +29,17 @@ unsafe impl Send for Error {}
 
 impl StdError for Error {
     fn source(&self) -> Option<&(dyn StdError + 'static)> {
-        self.source.as_ref().map(|c| &**c)
+        let mut source = self.source.as_ref().map(|c| &**c);
+        if source.is_none() {
+            match self.kind {
+                ErrorKind::Tera(ref err) => {
+                    source = err.source()
+                },
+                _ => ()
+            };
+        }
+
+        source
     }
 }
 

src/console.rs

@@ -8,6 +8,7 @@ use chrono::Duration;
 use termcolor::{Color, ColorChoice, ColorSpec, StandardStream, WriteColor};
 
 use site::Site;
+use errors::Error;
 
 lazy_static! {
     /// Termcolor color choice.
@@ -92,7 +93,7 @@ pub fn report_elapsed_time(instant: Instant) {
 }
 
 /// Display an error message and the actual error(s)
-pub fn unravel_errors(message: &str, error: &StdError) {
+pub fn unravel_errors(message: &str, error: &Error) {
     if !message.is_empty() {
         self::error(message);
     }