Macro etwin_core::declare_new_string

macro_rules! declare_new_string {
    (
    $(#[$struct_meta:meta])*
    $struct_vis:vis struct $struct_name:ident(String);
    $(#[$err_meta:meta])*
    $err_vis:vis type ParseError = $err_name:ident;
    const PATTERN = $pattern:expr;
    $(const SQL_NAME = $sql_name:literal;)?
  ) => { ... };
    (@impl_sqlx $struct_name:ident $sql_name:literal) => { ... };
}