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4ffe34ca
编写于
5月 24, 2012
作者:
E
Eric Holk
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Updating the comments in kind.rs to better reflect the current state of things.
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8b6bfc96
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1
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1 changed file
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18 addition
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5 deletion
+18
-5
src/rustc/middle/kind.rs
src/rustc/middle/kind.rs
+18
-5
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src/rustc/middle/kind.rs
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4ffe34ca
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@@ -9,15 +9,28 @@
import
syntax
::
print
::
pprust
::
expr_to_str
;
import
freevars
::
freevar_entry
;
// Kind analysis pass.
There are three kinds:
// Kind analysis pass.
//
// sendable: scalar types, and unique types containing only sendable types
// copyable: boxes, closures, and uniques containing copyable types
// noncopyable: resources, or unique types containing resources
// There are several kinds defined by various operations. The most restrictive
// kind is noncopyable. The noncopyable kind can be extended with any number
// of the following attributes.
//
// send: Things that can be sent on channels or included in spawned closures.
// copy: Things that can be copied.
// const: Things thare are deeply immutable. They are guaranteed never to
// change, and can be safely shared without copying between tasks.
//
// Send includes scalar types, resources and unique types containing only
// sendable types.
//
// Copy includes boxes, closure and unique types containing copyable types.
//
// Const include scalar types, things without non-const fields, and pointers
// to const things.
//
// This pass ensures that type parameters are only instantiated with types
// whose kinds are equal or less general than the way the type parameter was
// annotated (with the `send`
or `copy
` keyword).
// annotated (with the `send`
, `copy` or `const
` keyword).
//
// It also verifies that noncopyable kinds are not copied. Sendability is not
// applied, since none of our language primitives send. Instead, the sending
...
...
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