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rust: replace most "operation" structs with functions...

rust: replace most "operation" structs with functions The hg-core crate has a partially-formed concept of "operation", represented as structs with constructors and a `run` method. Each struct’s contructor takes different parameters, and each `run` has a different return type. Constructors typically don’t do much more than store parameters for `run` to access them. There was a comment about adding an `Operation` trait when the language supports expressing something so general, but it’s hard to imagine how operations with such different APIs could be used in a generic context. This commit starts removing the concept of "operation", since those are pretty much just functions. Differential Revision: https://phab.mercurial-scm.org/D9595

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             mod.rs
        
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                | application/rls-services+xml
            
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      //! A distinction is made between operations and commands.

      //! An operation is what can be done whereas a command is what is exposed by

      //! the cli. A single command can use several operations to achieve its goal.

      mod cat;

      mod debugdata;

      mod dirstate_status;

      mod find_root;

      mod list_tracked_files;

      pub use cat::{cat, CatRevError, CatRevErrorKind};

      pub use debugdata::{

          debug_data, DebugDataError, DebugDataErrorKind, DebugDataKind,

      };

      pub use find_root::{

          find_root, find_root_from_path, FindRootError, FindRootErrorKind,

      };

      pub use list_tracked_files::{

          list_rev_tracked_files, FilesForRev, ListRevTrackedFilesError,

          ListRevTrackedFilesErrorKind,

      };

      pub use list_tracked_files::{

          Dirstate, ListDirstateTrackedFilesError, ListDirstateTrackedFilesErrorKind,

      };

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				//! A distinction is made between operations and commands.
				//! An operation is what can be done whereas a command is what is exposed by
				//! the cli. A single command can use several operations to achieve its goal.

				mod cat;
				mod debugdata;
				mod dirstate_status;
				mod find_root;
				mod list_tracked_files;
				pub use cat::{cat, CatRevError, CatRevErrorKind};
				pub use debugdata::{
				debug_data, DebugDataError, DebugDataErrorKind, DebugDataKind,
				};
				pub use find_root::{
				find_root, find_root_from_path, FindRootError, FindRootErrorKind,
				};
				pub use list_tracked_files::{
				list_rev_tracked_files, FilesForRev, ListRevTrackedFilesError,
				ListRevTrackedFilesErrorKind,
				};
				pub use list_tracked_files::{
				Dirstate, ListDirstateTrackedFilesError, ListDirstateTrackedFilesErrorKind,
				};