Self in paths can only be used in start position

[alistaim]

When implementing the Cloudformation model, i get this error during the codegen gradle job

    Checking aws-sdk-cloudformation v0.0.7-alpha (/Users/mclean/code/smithy-rs/aws/sdk/build/aws-sdk/cloudformation)
error: expected identifier, found keyword `Self`
   --> cloudformation/src/model.rs:142:5
    |
142 |     Self,
    |     ^^^^ expected identifier, found keyword

error[E0433]: failed to resolve: `Self` in paths can only be used in start position
   --> cloudformation/src/model.rs:142:5
    |
142 |     Self,
    |     ^^^^ `Self` in paths can only be used in start position

error[E0433]: failed to resolve: `Self` in paths can only be used in start position
   --> cloudformation/src/model.rs:139:27
    |
139 | #[non_exhaustive]#[derive(std::clone::Clone, std::cmp::Eq, std::cmp::Ord, std::cmp::PartialEq, std::cmp::PartialOrd, std::fmt::Debug, std...
    |                           ^^^^^^^^^^^^^^^^^ `Self` in paths can only be used in start position

error[E0433]: failed to resolve: `Self` in paths can only be used in start position
   --> cloudformation/src/model.rs:149:31
    |
149 |             "SELF" => CallAs::Self,
    |                               ^^^^ `Self` in paths can only be used in start position

error[E0433]: failed to resolve: `Self` in paths can only be used in start position
   --> cloudformation/src/model.rs:165:21
    |
165 |             CallAs::Self => "SELF",
    |                     ^^^^ `Self` in paths can only be used in start position

error: aborting due to 5 previous errors

[alistaim]

Blocking addition of Cloudformation awslabs/aws-sdk-rust#25