Improve pprust-expanded #13596
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Improve pprust-expanded #13596
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Inject `extern crate {std, native}` before `use` statements.
Add `#![feature(glob)]` since `use std::prelude::*` is used.
(Unfortunately `rustc --pretty expanded` does not converge,
since `extern crate` and `use std::prelude::*` is injected at every
iteration.)
This patch renames `#[deriving]` into `#[!deriving]` (starting with `!`) to mark that expansion has completed. This makes output of `--pretty expanded` valid.
Some `Expr` needs parentheses when printed. For example, without parentheses, `ExprUnary(UnNeg, ExprBinary(BiAdd, ..))` becomes `-lhs + rhs` which is wrong. Those cases don't appear in ordinary code (since parentheses are explicitly added) but they can appear in manually crafted ast by extensions.
The tests use managed boxes, but are not perfectly feature-gated because they use `@` inside macros. (It causes issue after `--pretty expanded`.)
After testing `--pretty normal`, it tries to run `--pretty expanded` and typecheck output. Here we don't check convergence since it really diverges: for every iteration, some extra lines (e.g.`extern crate std`) are inserted. Some tests are `ignore-pretty`-ed since they cause various issues with `--pretty expanded`.
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Nice work, I love seeing progress on the pretty printer! |
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Closing due to inactivity, but feel free to reopen with a rebase! These fixes all seem legitimately useful! |
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This patchset fixes some bugs regarding pprust-expanded,
and make compiletest run
--pretty expandedtests.