Macro install_pretty_helpers 

macro_rules! install_pretty_helpers {
    ($allocator:ident : $allocator_type:ty) => { ... };
    (@$allocator:ident, $($(#[$($attrs:tt)*])*$name:ident{$($callable:tt)*}),*) => { ... };
}

Install pretty-printing helpers partially applied with a given local allocator.

This macro declares a set of small, local macros that proxy to the underlying pretty::DocAllocator methods and macro while capturing your allocator value. It keeps printing code concise and avoids passing the allocator around explicitly.

Syntax

install_pretty_helpers!(alloc_ident: AllocatorType)

• alloc_ident: the in-scope variable that implements both pretty::DocAllocator and Printer.
• AllocatorType: the concrete type of that variable.

What gets installed

• macro shorthands for common allocator methods: PrettyAstExt::nil, PrettyAstExt::fail, PrettyAstExt::hardline, PrettyAstExt::space, PrettyAstExt::line, PrettyAstExt::line_, PrettyAstExt::softline, PrettyAstExt::softline_, PrettyAstExt::as_string, PrettyAstExt::text, PrettyAstExt::concat, PrettyAstExt::intersperse, [PrettyAstExt::column], [PrettyAstExt::nesting], PrettyAstExt::reflow.
• a partially applied version of pretty::docs!.
• todo_document!: produce a placeholder document (that does not panic).