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rust: Add type annotation to fix inference on Rust Nightly...

rust: Add type annotation to fix inference on Rust Nightly When compiling with Rust Nightly, the im-rs crate silently makes use of the experimental language feature for trait impl specialization. This apperently changes public its APIs in subtle ways such that type inference of some user code can fail where it succeeds when specialization is disabled. This made Mercurial’s Rust unit tests have compilation errors on Nightly. I have not managed to find the exactl root cause, but I wrote down my findings so far at https://github.com/bodil/im-rs/issues/188 This adds type annotation to make unit tests rely less on type inference and work around the issue. Differential Revision: https://phab.mercurial-scm.org/D10742

Gregory Szorc - - Load All Authors

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      from typing import (

          AnyStr,

          IO,

          List,

          Sequence,

      )

      version: int

      class stat:

          st_dev: int

          st_mode: int

          st_nlink: int

          st_size: int

          st_mtime: int

          st_ctime: int

      def listdir(path: bytes, st: bool, skip: bool) -> List[stat]: ...

      def posixfile(name: AnyStr, mode: bytes, buffering: int) -> IO: ...

      def statfiles(names: Sequence[bytes]) -> List[stat]: ...

      def recvfds(sockfd: int) -> List[int]: ...

      def setprocname(name: bytes) -> None: ...

      def getfstype(path: bytes) -> bytes: ...

      def getfsmountpoint(path: bytes) -> bytes: ...

      def unblocksignal(sig: int) -> None: ...

      def isgui() -> bool: ...

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				from typing import (
				AnyStr,
				IO,
				List,
				Sequence,
				)

				version: int

				class stat:
				st_dev: int
				st_mode: int
				st_nlink: int
				st_size: int
				st_mtime: int
				st_ctime: int

				def listdir(path: bytes, st: bool, skip: bool) -> List[stat]: ...
				def posixfile(name: AnyStr, mode: bytes, buffering: int) -> IO: ...
				def statfiles(names: Sequence[bytes]) -> List[stat]: ...
				def recvfds(sockfd: int) -> List[int]: ...
				def setprocname(name: bytes) -> None: ...
				def getfstype(path: bytes) -> bytes: ...
				def getfsmountpoint(path: bytes) -> bytes: ...
				def unblocksignal(sig: int) -> None: ...
				def isgui() -> bool: ...