Suppress redundant_field_names clippy lint

    warning: redundant field names in struct initialization
      --> tests/test_from.rs:9:5
       |
     9 | /     #[from]
    10 | |     source: io::Error,
       | |__________^ help: replace it with: `source`
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
       = note: `-W clippy::redundant-field-names` implied by `-W clippy::all`
       = help: to override `-W clippy::all` add `#[allow(clippy::redundant_field_names)]`

    warning: redundant field names in struct initialization
      --> tests/test_from.rs:32:9
       |
    32 | /         #[from]
    33 | |         source: io::Error,
       | |______________^ help: replace it with: `source`
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names

    warning: redundant field names in struct initialization
       --> tests/test_generics.rs:145:5
        |
    145 | /     #[from]
    146 | |     pub source: StructDebugGeneric<E>,
        | |______________^ help: replace it with: `source`
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
        = note: `-W clippy::redundant-field-names` implied by `-W clippy::all`
        = help: to override `-W clippy::all` add `#[allow(clippy::redundant_field_names)]`

Author: dtolnay

impl/src/expand.rs

@@ -171,6 +171,7 @@ fn impl_struct(input: Struct) -> TokenStream {
         let source_var = Ident::new("source", span);
         let body = from_initializer(from_field, backtrace_field, &source_var);
         let from_function = quote! {
+            #[allow(clippy::redundant_field_names)]
             fn from(#source_var: #from) -> Self {
                 #ty #body
             }
@@ -453,6 +454,7 @@ fn impl_enum(input: Enum) -> TokenStream {
         let source_var = Ident::new("source", span);
         let body = from_initializer(from_field, backtrace_field, &source_var);
         let from_function = quote! {
+            #[allow(clippy::redundant_field_names)]
             fn from(#source_var: #from) -> Self {
                 #ty::#variant #body
             }