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warning: `peek` never called on `Peekable` iterator
--> compiler\rustc_session\src\utils.rs:130:13
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130 | let mut args = std::env::args_os().map(|arg| arg.to_string_lossy().to_string()).peekable();
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= help: consider removing the call to `peekable`
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_peekable
warning: `peek` never called on `Peekable` iterator
--> compiler\rustc_trait_selection\src\traits\error_reporting\suggestions.rs:4934:17
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4934 | let mut bounds = pred.bounds.iter().peekable();
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= help: consider removing the call to `peekable`
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_peekable
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To make it available to other parts of the compiler.
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Add `try_canonicalize` to `rustc_fs_util` and use it over `fs::canonicalize`
This adds `try_canonicalize` which tries to call `fs::canonicalize`, but falls back to `std::path::absolute` if it fails. Existing `canonicalize` calls are replaced with it. `fs::canonicalize` is not guaranteed to work on Windows.
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They don't seem particularly useful as I don't expect
native libraries to change frequently.
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arbitrary link argument like -C link-arg, but respecting relative order to other `-l` options, unstable
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The lowered forms goes to metadata, for example during encoding of macro definitions
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specifically
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Signed-off-by: codehorseman <cricis@yeah.net>
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This commit implements both the native linking modifiers infrastructure
as well as an initial attempt at the individual modifiers from the RFC.
It also introduces a feature flag for the general syntax along with
individual feature flags for each modifier.
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This PR modifies the macro expansion infrastructure to handle attributes
in a fully token-based manner. As a result:
* Derives macros no longer lose spans when their input is modified
by eager cfg-expansion. This is accomplished by performing eager
cfg-expansion on the token stream that we pass to the derive
proc-macro
* Inner attributes now preserve spans in all cases, including when we
have multiple inner attributes in a row.
This is accomplished through the following changes:
* New structs `AttrAnnotatedTokenStream` and `AttrAnnotatedTokenTree` are introduced.
These are very similar to a normal `TokenTree`, but they also track
the position of attributes and attribute targets within the stream.
They are built when we collect tokens during parsing.
An `AttrAnnotatedTokenStream` is converted to a regular `TokenStream` when
we invoke a macro.
* Token capturing and `LazyTokenStream` are modified to work with
`AttrAnnotatedTokenStream`. A new `ReplaceRange` type is introduced, which
is created during the parsing of a nested AST node to make the 'outer'
AST node aware of the attributes and attribute target stored deeper in the token stream.
* When we need to perform eager cfg-expansion (either due to `#[derive]` or `#[cfg_eval]`),
we tokenize and reparse our target, capturing additional information about the locations of
`#[cfg]` and `#[cfg_attr]` attributes at any depth within the target.
This is a performance optimization, allowing us to perform less work
in the typical case where captured tokens never have eager cfg-expansion run.
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