fixes microsoft#161

This change replaces stringly-typed anyhow errors with
thiserror-constructed explicit error enums.

The following strategy has been used in the conversion:

- Every module maintains its own error enum
- Exception is builtins/*.rs in which all errors are consolidated in one
  enum to avoid duplication
- Source errors are being wrapped and propagated in the error string
- Crate-specific businesslogic errors have been convernted into their
  own enum
- A simple `bail!` macro has been added to reduce changes
- Extension fn's require a `Box<dyn std::error::Error>` error type. it
  would be nice if the Extension fn's could have a result with trait
  bound `std::error::Error` but that requires some unergonomic type
  gymnastics on the trait + impls
- A local type alias for `Result` has been added to modules to reduce
  changes in the Signatures where reasonable.

Signed-off-by: Magnus Kulke <[email protected]>

fixes microsoft#161

This change replaces stringly-typed anyhow errors with
thiserror-constructed explicit error enums.

The following strategy has been used in the conversion:

- Every module maintains its own error enum
- Exception is builtins/*.rs in which all errors are consolidated in one
  enum to avoid duplication
- Source errors are being wrapped and propagated in the error string
- Crate-specific businesslogic errors have been convernted into their
  own enum
- A simple `bail!` macro has been added to reduce changes
- Extension fn's require a `Box<dyn std::error::Error>` error type. it
  would be nice if the Extension fn's could have a result with trait
  bound `std::error::Error` but that requires some unergonomic type
  gymnastics on the trait + impls
- A local type alias for `Result` has been added to modules to reduce
  changes in the Signatures where reasonable.

Signed-off-by: Magnus Kulke <[email protected]>

fixes microsoft#161

This change replaces stringly-typed anyhow errors with
thiserror-constructed explicit error enums.

The following strategy has been used in the conversion:

- Every module maintains its own error enum
- Exception is builtins/*.rs in which all errors are consolidated in one
  enum to avoid duplication
- Source errors are being wrapped and propagated in the error string
- Crate-specific businesslogic errors have been convernted into their
  own enum
- A simple `bail!` macro has been added to reduce changes
- Extension fn's require a `Box<dyn std::error::Error>` error type. it
  would be nice if the Extension fn's could have a result with trait
  bound `std::error::Error` but that requires some unergonomic type
  gymnastics on the trait + impls
- A local type alias for `Result` has been added to modules to reduce
  changes in the Signatures where reasonable.

Signed-off-by: Magnus Kulke <[email protected]>

fixes microsoft#161

This change replaces stringly-typed anyhow errors with
thiserror-constructed explicit error enums.

The following strategy has been used in the conversion:

- Every module maintains its own error enum
- Exception is builtins/*.rs in which all errors are consolidated in one
  enum to avoid duplication
- Source errors are being wrapped and propagated in the error string
- Crate-specific businesslogic errors have been convernted into their
  own enum
- A simple `bail!` macro has been added to reduce changes
- Extension fn's require a `Box<dyn std::error::Error>` error type. it
  would be nice if the Extension fn's could have a result with trait
  bound `std::error::Error` but that requires some unergonomic type
  gymnastics on the trait + impls
- A local type alias for `Result` has been added to modules to reduce
  changes in the signatures where reasonable.

Signed-off-by: Magnus Kulke <[email protected]>

fixes microsoft#161

This change replaces stringly-typed anyhow errors with
thiserror-constructed explicit error enums.

The following strategy has been used in the conversion:

- Every module maintains its own error enum
- Exception is builtins/*.rs in which all errors are consolidated in one
  enum to avoid duplication
- Source errors are being wrapped and propagated in the error string
- Crate-specific businesslogic errors have been convernted into their
  own enum
- A simple `bail!` macro has been added to reduce changes
- Extension fn's require a `Box<dyn std::error::Error>` error type. it
  would be nice if the Extension fn's could have a result with trait
  bound `std::error::Error` but that requires some unergonomic type
  gymnastics on the trait + impls
- A local type alias for `Result` has been added to modules to reduce
  changes in the signatures where reasonable.

Signed-off-by: Magnus Kulke <[email protected]>