cause fn is deprecated in favor of source

yerke · yerke · commit 01d08e35a1ca · 2019-02-03T16:37:21.000-08:00
diff --git a/src/error/multiple_error_types/wrap_error.md b/src/error/multiple_error_types/wrap_error.md
@@ -29,7 +29,7 @@ impl fmt::Display for DoubleError {
 }
 
 impl error::Error for DoubleError {
-    fn cause(&self) -> Option<&error::Error> {
+    fn source(&self) -> Option<&(dyn error::Error + 'static)> {
         match *self {
             DoubleError::EmptyVec => None,
             // The cause is the underlying implementation error type. Is implicitly

Original file line number	Diff line number	Diff line change
`@@ -29,7 +29,7 @@ impl fmt::Display for DoubleError {`
`29`	`29`	`}`
`30`	`30`
`31`	`31`	`impl error::Error for DoubleError {`
`32`		`- fn cause(&self) -> Option<&error::Error> {`
	`32`	`+ fn source(&self) -> Option<&(dyn error::Error + 'static)> {`
`33`	`33`	`match *self {`
`34`	`34`	`DoubleError::EmptyVec => None,`
`35`	`35`	`// The cause is the underlying implementation error type. Is implicitly`