asserteq_pretty_macros 0.0.3

Proc macros for asserteq_pretty
Documentation 
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// From derive-getters crate

//! Common functions

use proc_macro2::Span;
use syn::{Data, DataStruct, DeriveInput, Error, Fields, FieldsNamed, Result};

use crate::faultmsg::{Problem, StructIs};

pub fn named_fields(structure: &DataStruct) -> Result<&FieldsNamed> {
    match structure.fields {
        Fields::Named(ref fields) => Ok(fields),
        Fields::Unnamed(_) | Fields::Unit => {
            Err(Error::new(Span::call_site(), Problem::UnnamedField))
        }
    }
}

pub fn named_struct(node: &DeriveInput) -> Result<&DataStruct> {
    match node.data {
        Data::Struct(ref structure) => Ok(structure),
        Data::Enum(_) => Err(Error::new_spanned(
            node,
            Problem::NotNamedStruct(StructIs::Enum),
        )),
        Data::Union(_) => Err(Error::new_spanned(
            node,
            Problem::NotNamedStruct(StructIs::Union),
        )),
    }
}