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Use `splice` to avoid shifting the other items twice.
Put `extern crate std;` first so it's already resolved when we resolve `::std::prelude::rust_20XX`.
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Signed-off-by: Jonathan Brouwer <jonathantbrouwer@gmail.com>
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In the AST the "then" block is represented as a `Block`. In HIR the
"then" block is represented as an `Expr` that happens to always be.
`ExprKind::Block`. By deconstructing the `ExprKind::Block` to extract
the block within, things print properly.
For `issue-82392.rs`, note that we no longer print a type after the
"then" block. This is good, it now matches how we don't print a type for
the "else" block. (Well, we do print a type after the "else" block, but
it's for the whole if/else.)
Also tighten up some of the pattern matching -- these block expressions
within if/else will never have labels.
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By removing some of the over-indenting. AST pretty printing now looks
correct. HIR pretty printing is better, but still over-indents some.
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Indents for `cbox` and `ibox` are 0 or `INDENT_UNIT` (4) except for a
couple of places which are `INDENT_UNIT - 1` for no clear reason.
This commit changes the three space indents to four spaces.
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These emit prelude imports which means they are always edition dependent
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