Bump similar_asserts to 1.6

This allows us to remove a call to `String::leak` as they relaxed the
life time requirements on the one method we use.

diesel_cli/Cargo.toml

@@ -56,7 +56,7 @@ syn = { version = "2", features = ["visit"] }
 tracing = "0.1"
 tracing-subscriber = { version = "0.3.10", features = ["env-filter"] }
 thiserror = "1.0.10"
-similar-asserts = "1.5.0"
+similar-asserts = "1.6.0"
 
 [dependencies.diesel]
 version = "~2.2.0"

diesel_cli/src/main.rs

@@ -283,13 +283,11 @@ fn regenerate_schema_if_file_specified(matches: &ArgMatches) -> Result<(), crate
                     .map_err(|e| crate::errors::Error::IoError(e, Some(path.to_owned())))?;
 
                 if schema.lines().ne(old_buf.lines()) {
-                    // it's fine to leak here, we will
-                    // exit the application anyway soon
                     let label = path.file_name().expect("We have a file name here");
-                    let label = label.to_string_lossy().into_owned().leak();
+                    let label = label.to_string_lossy();
                     println!(
                         "{}",
-                        SimpleDiff::from_str(&old_buf, &schema, label, "new schema")
+                        SimpleDiff::from_str(&old_buf, &schema, &label, "new schema")
                     );
                     return Err(crate::errors::Error::SchemaWouldChange(
                         path.display().to_string(),