Merge pull request #1151 from yerke/remove-deprecated-methods-from-er…

…ror-trait

Do not use deprecated functions from `std::error::Error` trait

src/error/multiple_error_types/define_error_type.md

@@ -40,11 +40,7 @@ impl fmt::Display for DoubleError {
 
 // This is important for other errors to wrap this one.
 impl error::Error for DoubleError {
- fn description(&self) -> &str {
- "invalid first item to double"
- }
-
- fn cause(&self) -> Option<&error::Error> {
+ fn source(&self) -> Option<&(dyn error::Error + 'static)> {
  // Generic error, underlying cause isn't tracked.
  None
  }

src/error/multiple_error_types/wrap_error.md

@@ -29,15 +29,7 @@ impl fmt::Display for DoubleError {
 }
 
 impl error::Error for DoubleError {
- fn description(&self) -> &str {
- match *self {
- DoubleError::EmptyVec => "empty vectors not allowed",
- // This already impls `Error`, so defer to its own implementation.
- DoubleError::Parse(ref e) => e.description(),
- }
- }
-
- 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