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The general theme of this is to make parser a better independent
library.
The specific thing we do here is replacing callback based TreeSink with
a data structure. That is, rather than calling user-provided tree
construction methods, the parser now spits out a very bare-bones tree,
effectively a log of a DFS traversal.
This makes the parser usable without any *specifc* tree sink, and allows
us to, eg, move tests into this crate.
Now, it's also true that this is a distinction without a difference, as
the old and the new interface are equivalent in expressiveness. Still,
this new thing seems somewhat simpler. But yeah, I admit I don't have a
suuper strong motivation here, just a hunch that this is better.
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Previously we swapped to events in the buffer, but that might be wrong
if there aer `forward_parent` links pointing to the swapped-out node.
Let's do the same via parent links instead, keeping the nodes in place
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These were the warnings previously:
```
warning: could not parse code block as Rust code
--> crates/stdx/src/lib.rs:137:9
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137 | /// ∀ x in slice[..idx]: pred(x)
| _________^
138 | | /// && ∀ x in slice[idx..]: !pred(x)
| |____^
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= note: error from rustc: unknown start of token: \u{2200}
warning: 1 warning emitted
warning: unresolved link to `package`
--> crates/base_db/src/input.rs:181:15
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181 | /// it's [package].name, can be different for other project types or even
| ^^^^^^^ no item named `package` in scope
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= note: `#[warn(broken_intra_doc_links)]` on by default
= help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
warning: unresolved link to `package`
--> crates/base_db/src/input.rs:181:15
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181 | /// it's [package].name, can be different for other project types or even
| ^^^^^^^ no item named `package` in scope
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= help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
warning: 2 warnings emitted
warning: unresolved link to `package`
--> crates/base_db/src/input.rs:181:15
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181 | /// it's [package].name, can be different for other project types or even
| ^^^^^^^ no item named `package` in scope
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= note: `#[warn(broken_intra_doc_links)]` on by default
= help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
warning: unresolved link to `package`
--> crates/base_db/src/input.rs:181:15
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181 | /// it's [package].name, can be different for other project types or even
| ^^^^^^^ no item named `package` in scope
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= help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
warning: 2 warnings emitted
```
This does *not* fix the following warning, because it is actually rust
code and rustdoc is being over eager:
```
warning: Rust code block is empty
--> crates/parser/src/grammar.rs:16:5
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16 | //! ```
| _____^
17 | | //! // test function_with_zero_parameters
18 | | //! // fn foo() {}
19 | | //! ```
| |_______^
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help: mark blocks that do not contain Rust code as text
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16 | //! ```text
| ^^^^^^^
```
https://github.com/rust-lang/rust/pull/79816 should make this
configurable so the warning can be `allow`ed.
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