Implement formatting for let_chains #5495
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Currently, if-statements with let chains in them are completely skipped, because
format_expr
fails on theExprKind::Let
.Implement it by copying some logic from
ControlFlow::rewrite_pat_expr
. Then, simplifyControlFlow
by removing explicit support forif let
/while let
, instead delegating toformat_expr
. Some logic still remains to supportfor <pat> in <expr>
, however.