Attribute for handwritten where clauses
Addresses (2) and (3) in https://github.com/serde-rs/serde/issues/336#issuecomment-220378916.
- If there is a `#[serde(bound="...")]` attribute on the type, use the union of that and the actual type's `where` clause as the `where` clause for the impl and do not attempt to generate any additional `where` clauses whatsoever.
- If there is a `#[serde(bound="...")]` attribute on a field, use that and do not attempt to generate any additional `where` clauses for the field.
The `bound` attribute behaves similar to `rename` in that you can specify a single attribute that applies to both ser and de, or individual ones.
```
#[serde(bound="D: Serialize + Deserialize")]
#[serde(bound(serialize="D: Serialize", deserialize="D: Deserialize"))]
```
EDIT: now addresses (4) from https://github.com/serde-rs/serde/issues/336#issuecomment-220378916 as well.
- If a field contains direct recursion, do not generate any bounds based on that field except from `bound` attributes.
Reduce code duplication in Deserialize generator
This combines `deserialize_newtype_struct`, `deserialize_tuple_struct`, and `deserialize_tuple_variant` into a single method `deserialize_tuple`, as well as `deserialize_struct` and `deserialize_struct_variant` into a single method `deserialize_struct`. No behavior changes.
This combines deserialize_newtype_struct, deserialize_tuple_struct,
and deserialize_tuple_variant into a single method deserialize_tuple,
as well as deserialize_struct and deserialize_struct_variant into a
single method deserialize_struct. No behavior changes.
feat(codegen): Detect repeated struct field when deserializing
Addresses #59. Let me know whether you think we need an escape hatch to opt out of this check.
These changes are fairly invasive to imports and uses of non-libcore types,
but allow for some or none of the freestanding crates (core, rustc_unicode,
alloc, collections) to be supported by serde.
