Function snippet_block_with_context 

pub fn snippet_block_with_context<'sm>(
    sm: impl HasSourceMap<'sm>,
    span: Span,
    outer: SyntaxContext,
    default: &str,
    indent_relative_to: Option<Span>,
    app: &mut Applicability,
) -> (String, bool)

Combination of snippet_block and snippet_with_context.