Upgrade to nom 6

Cargo.toml

@@ -36,7 +36,7 @@ serde = { version = "1", optional = true, features = ["derive"] }
 serde_json = { version = "1", optional = true }
 
 # smtp
-nom = { version = "5", optional = true }
+nom = { version = "6", default-features = false, features = ["alloc"], optional = true }
 r2d2 = { version = "0.8", optional = true } # feature
 hostname = { version = "0.3", optional = true } # feature
 

src/transport/smtp/client/async_connection.rs

@@ -268,11 +268,11 @@ impl AsyncSmtpConnection {
                     return Err(response.into());
                 }
                 Err(nom::Err::Failure(e)) => {
-                    return Err(Error::Parsing(e.1));
+                    return Err(Error::Parsing(e.code));
                 }
                 Err(nom::Err::Incomplete(_)) => { /* read more */ }
                 Err(nom::Err::Error(e)) => {
-                    return Err(Error::Parsing(e.1));
+                    return Err(Error::Parsing(e.code));
                 }
             }
         }

src/transport/smtp/client/connection.rs

@@ -253,11 +253,11 @@ impl SmtpConnection {
                     return Err(response.into());
                 }
                 Err(nom::Err::Failure(e)) => {
-                    return Err(Error::Parsing(e.1));
+                    return Err(Error::Parsing(e.code));
                 }
                 Err(nom::Err::Incomplete(_)) => { /* read more */ }
                 Err(nom::Err::Error(e)) => {
-                    return Err(Error::Parsing(e.1));
+                    return Err(Error::Parsing(e.code));
                 }
             }
         }

src/transport/smtp/error.rs

@@ -109,12 +109,12 @@ impl From<native_tls::Error> for Error {
     }
 }
 
-impl From<nom::Err<(&str, nom::error::ErrorKind)>> for Error {
+impl From<nom::Err<nom::error::Error<&str>>> for Error {
-    fn from(err: nom::Err<(&str, nom::error::ErrorKind)>) -> Error {
+    fn from(err: nom::Err<nom::error::Error<&str>>) -> Error {
         Parsing(match err {
             nom::Err::Incomplete(_) => nom::error::ErrorKind::Complete,
-            nom::Err::Failure((_, k)) => k,
+            nom::Err::Failure(e) => e.code,
-            nom::Err::Error((_, k)) => k,
+            nom::Err::Error(e) => e.code,
         })
     }
 }

src/transport/smtp/response.rs

@@ -238,7 +238,10 @@ pub(crate) fn parse_response(i: &str) -> IResult<&str, Response> {
 
     // Check that all codes are equal.
     if !lines.iter().all(|&(code, _, _)| code == last_code) {
-        return Err(nom::Err::Failure(("", nom::error::ErrorKind::Not)));
+        return Err(nom::Err::Failure(nom::error::Error::new(
+            "",
+            nom::error::ErrorKind::Not,
+        )));
     }
 
     // Extract text from lines, and append last line.