auto merge of rust-lang#13184 : alexcrichton/rust/priv-fields, r=brson

This is an implementation of a portion of [RFC #4](https://github.com/rust-lang/rfcs/blob/master/active/0004-private-fields.md). This PR makes named struct fields private by default (as opposed to inherited by default).

The only real meaty change is the first commit to `rustc`, all other commits are just fallout of that change.

Summary of changes made:

* Named fields are private by default *everywhere*
* The `priv` keyword is now default-deny on named fields (done in a "lint" pass in privacy)

Changes yet to be done (before the RFC is closed)

* Change tuple structs to have private fields by default
* Remove `priv` enum variants
* Make `priv` a reserved keyword

src/compiletest/common.rs

@@ -21,87 +21,87 @@ pub enum mode {
 #[deriving(Clone)]
 pub struct config {
     // The library paths required for running the compiler
-    compile_lib_path: ~str,
+    pub compile_lib_path: ~str,
 
     // The library paths required for running compiled programs
-    run_lib_path: ~str,
+    pub run_lib_path: ~str,
 
     // The rustc executable
-    rustc_path: Path,
+    pub rustc_path: Path,
 
     // The clang executable
-    clang_path: Option<Path>,
+    pub clang_path: Option<Path>,
 
     // The llvm binaries path
-    llvm_bin_path: Option<Path>,
+    pub llvm_bin_path: Option<Path>,
 
     // The directory containing the tests to run
-    src_base: Path,
+    pub src_base: Path,
 
     // The directory where programs should be built
-    build_base: Path,
+    pub build_base: Path,
 
     // Directory for auxiliary libraries
-    aux_base: Path,
+    pub aux_base: Path,
 
     // The name of the stage being built (stage1, etc)
-    stage_id: ~str,
+    pub stage_id: ~str,
 
     // The test mode, compile-fail, run-fail, run-pass
-    mode: mode,
+    pub mode: mode,
 
     // Run ignored tests
-    run_ignored: bool,
+    pub run_ignored: bool,
 
     // Only run tests that match this filter
-    filter: Option<~str>,
+    pub filter: Option<~str>,
 
     // Write out a parseable log of tests that were run
-    logfile: Option<Path>,
+    pub logfile: Option<Path>,
 
     // Write out a json file containing any metrics of the run
-    save_metrics: Option<Path>,
+    pub save_metrics: Option<Path>,
 
     // Write and ratchet a metrics file
-    ratchet_metrics: Option<Path>,
+    pub ratchet_metrics: Option<Path>,
 
     // Percent change in metrics to consider noise
-    ratchet_noise_percent: Option<f64>,
+    pub ratchet_noise_percent: Option<f64>,
 
-    // "Shard" of the testsuite to run: this has the form of
+    // "Shard" of the testsuite to pub run: this has the form of
     // two numbers (a,b), and causes only those tests with
     // positional order equal to a mod b to run.
-    test_shard: Option<(uint,uint)>,
+    pub test_shard: Option<(uint,uint)>,
 
     // A command line to prefix program execution with,
     // for running under valgrind
-    runtool: Option<~str>,
+    pub runtool: Option<~str>,
 
     // Flags to pass to the compiler when building for the host
-    host_rustcflags: Option<~str>,
+    pub host_rustcflags: Option<~str>,
 
     // Flags to pass to the compiler when building for the target
-    target_rustcflags: Option<~str>,
+    pub target_rustcflags: Option<~str>,
 
     // Run tests using the JIT
-    jit: bool,
+    pub jit: bool,
 
     // Target system to be tested
-    target: ~str,
+    pub target: ~str,
 
     // Host triple for the compiler being invoked
-    host: ~str,
+    pub host: ~str,
 
     // Extra parameter to run adb on arm-linux-androideabi
-    adb_path: ~str,
+    pub adb_path: ~str,
 
     // Extra parameter to run test sute on arm-linux-androideabi
-    adb_test_dir: ~str,
+    pub adb_test_dir: ~str,
 
     // status whether android device available or not
-    adb_device_status: bool,
+    pub adb_device_status: bool,
 
     // Explain what's going on
-    verbose: bool
+    pub verbose: bool
 
 }

src/compiletest/errors.rs

@@ -10,7 +10,11 @@
 
 use std::io::{BufferedReader, File};
 
-pub struct ExpectedError { line: uint, kind: ~str, msg: ~str }
+pub struct ExpectedError {
+    pub line: uint,
+    pub kind: ~str,
+    pub msg: ~str,
+}
 
 // Load any test directives embedded in the file
 pub fn load_errors(testfile: &Path) -> Vec<ExpectedError> {

src/compiletest/header.rs

@@ -14,26 +14,26 @@ use util;
 
 pub struct TestProps {
     // Lines that should be expected, in order, on standard out
-    error_patterns: Vec<~str> ,
+    pub error_patterns: Vec<~str> ,
     // Extra flags to pass to the compiler
-    compile_flags: Option<~str>,
+    pub compile_flags: Option<~str>,
     // If present, the name of a file that this test should match when
     // pretty-printed
-    pp_exact: Option<Path>,
+    pub pp_exact: Option<Path>,
     // Modules from aux directory that should be compiled
-    aux_builds: Vec<~str> ,
+    pub aux_builds: Vec<~str> ,
     // Environment settings to use during execution
-    exec_env: Vec<(~str,~str)> ,
+    pub exec_env: Vec<(~str,~str)> ,
     // Commands to be given to the debugger, when testing debug info
-    debugger_cmds: Vec<~str> ,
+    pub debugger_cmds: Vec<~str> ,
     // Lines to check if they appear in the expected debugger output
-    check_lines: Vec<~str> ,
+    pub check_lines: Vec<~str> ,
     // Flag to force a crate to be built with the host architecture
-    force_host: bool,
+    pub force_host: bool,
     // Check stdout for error-pattern output as well as stderr
-    check_stdout: bool,
+    pub check_stdout: bool,
     // Don't force a --crate-type=dylib flag on the command line
-    no_prefer_dynamic: bool,
+    pub no_prefer_dynamic: bool,
 }
 
 // Load any test directives embedded in the file

src/compiletest/procsrv.rs

@@ -57,7 +57,7 @@ fn target_env(lib_path: &str, prog: &str) -> Vec<(~str,~str)> {
     return env;
 }
 
-pub struct Result {status: ProcessExit, out: ~str, err: ~str}
+pub struct Result {pub status: ProcessExit, pub out: ~str, pub err: ~str}
 
 pub fn run(lib_path: &str,
            prog: &str,

src/doc/guide-unsafe.md

@@ -200,7 +200,7 @@ use std::ptr;
 // Unique<T> has the same semantics as ~T
 pub struct Unique<T> {
     // It contains a single raw, mutable pointer to the object in question.
-    priv ptr: *mut T
+    ptr: *mut T
 }
 
 // Implement methods for creating and using the values in the box.

src/doc/rust.md

@@ -1527,12 +1527,9 @@ of an item to see whether it should be allowed or not. This is where privacy
 warnings are generated, or otherwise "you used a private item of another module
 and weren't allowed to."
 
-By default, everything in rust is *private*, with two exceptions. The first
-exception is that struct fields are public by default (but the struct itself is
-still private by default), and the remaining exception is that enum variants in
-a `pub` enum are the default visibility of the enum container itself.. You are
-allowed to alter this default visibility with the `pub` keyword (or `priv`
-keyword for struct fields and enum variants). When an item is declared as `pub`,
+By default, everything in rust is *private*, with one exception. Enum variants
+in a `pub` enum are also public by default. You are allowed to alter this
+default visibility with the `priv` keyword. When an item is declared as `pub`,
 it can be thought of as being accessible to the outside world. For example:
 
 ~~~~
@@ -1542,7 +1539,7 @@ struct Foo;
 
 // Declare a public struct with a private field
 pub struct Bar {
-    priv field: int
+    field: int
 }
 
 // Declare a public enum with public and private variants
@@ -2354,7 +2351,7 @@ The following are examples of structure expressions:
 ~~~~
 # struct Point { x: f64, y: f64 }
 # struct TuplePoint(f64, f64);
-# mod game { pub struct User<'a> { name: &'a str, age: uint, score: uint } }
+# mod game { pub struct User<'a> { pub name: &'a str, pub age: uint, pub score: uint } }
 # struct Cookie; fn some_fn<T>(t: T) {}
 Point {x: 10.0, y: 20.0};
 TuplePoint(10.0, 20.0);
@@ -3140,7 +3137,7 @@ The types `char` and `str` hold textual data.
 A value of type `char` is a [Unicode scalar value](
 http://www.unicode.org/glossary/#unicode_scalar_value)
 (ie. a code point that is not a surrogate),
-represented as a 32-bit unsigned word in the 0x0000 to 0xD7FF 
+represented as a 32-bit unsigned word in the 0x0000 to 0xD7FF
 or 0xE000 to 0x10FFFF range.
 A `[char]` vector is effectively an UCS-4 / UTF-32 string.
 

src/doc/tutorial.md

@@ -2657,8 +2657,8 @@ Rust doesn't support encapsulation: both struct fields and methods can
 be private. But this encapsulation is at the module level, not the
 struct level.
 
-For convenience, fields are _public_ by default, and can be made _private_ with
-the `priv` keyword:
+Fields are _private_ by default, and can be made _public_ with
+the `pub` keyword:
 
 ~~~
 mod farm {
@@ -2667,8 +2667,8 @@ mod farm {
 # impl Human { pub fn rest(&self) { } }
 # pub fn make_me_a_farm() -> Farm { Farm { chickens: ~[], farmer: Human(0) } }
     pub struct Farm {
-        priv chickens: ~[Chicken],
-        farmer: Human
+        chickens: ~[Chicken],
+        pub farmer: Human
     }
 
     impl Farm {

src/libarena/lib.rs

@@ -25,6 +25,8 @@
 #![allow(missing_doc)]
 #![feature(managed_boxes)]
 
+#![allow(visible_private_types)] // NOTE: remove after a stage0 snap
+
 extern crate collections;
 
 use std::cast::{transmute, transmute_mut, transmute_mut_region};
@@ -83,9 +85,9 @@ pub struct Arena {
     // The head is separated out from the list as a unbenchmarked
     // microoptimization, to avoid needing to case on the list to
     // access the head.
-    priv head: Chunk,
-    priv copy_head: Chunk,
-    priv chunks: RefCell<Vec<Chunk>>,
+    head: Chunk,
+    copy_head: Chunk,
+    chunks: RefCell<Vec<Chunk>>,
 }
 
 impl Arena {
@@ -333,14 +335,14 @@ fn test_arena_destructors_fail() {
 /// run again for these objects.
 pub struct TypedArena<T> {
     /// A pointer to the next object to be allocated.
-    priv ptr: *T,
+    ptr: *T,
 
     /// A pointer to the end of the allocated area. When this pointer is
     /// reached, a new chunk is allocated.
-    priv end: *T,
+    end: *T,
 
     /// A pointer to the first arena segment.
-    priv first: Option<~TypedArenaChunk<T>>,
+    first: Option<~TypedArenaChunk<T>>,
 }
 
 struct TypedArenaChunk<T> {

src/libcollections/bitv.rs

@@ -227,9 +227,9 @@ enum Op {Union, Intersect, Assign, Difference}
 #[deriving(Clone)]
 pub struct Bitv {
     /// Internal representation of the bit vector (small or large)
-    priv rep: BitvVariant,
+    rep: BitvVariant,
     /// The number of valid bits in the internal representation
-    priv nbits: uint
+    nbits: uint
 }
 
 fn die() -> ! {
@@ -587,9 +587,9 @@ fn iterate_bits(base: uint, bits: uint, f: |uint| -> bool) -> bool {
 
 /// An iterator for `Bitv`.
 pub struct Bits<'a> {
-    priv bitv: &'a Bitv,
-    priv next_idx: uint,
-    priv end_idx: uint,
+    bitv: &'a Bitv,
+    next_idx: uint,
+    end_idx: uint,
 }
 
 impl<'a> Iterator<bool> for Bits<'a> {
@@ -648,12 +648,12 @@ impl<'a> RandomAccessIterator<bool> for Bits<'a> {
 /// as a `uint`.
 #[deriving(Clone)]
 pub struct BitvSet {
-    priv size: uint,
+    size: uint,
 
     // In theory this is a `Bitv` instead of always a `BigBitv`, but knowing that
     // there's an array of storage makes our lives a whole lot easier when
     // performing union/intersection/etc operations
-    priv bitv: BigBitv
+    bitv: BigBitv
 }
 
 impl BitvSet {
@@ -912,8 +912,8 @@ impl BitvSet {
 }
 
 pub struct BitPositions<'a> {
-    priv set: &'a BitvSet,
-    priv next_idx: uint
+    set: &'a BitvSet,
+    next_idx: uint
 }
 
 impl<'a> Iterator<uint> for BitPositions<'a> {

src/libcollections/btree.rs

@@ -23,10 +23,10 @@ use std::fmt::Show;
 
 #[allow(missing_doc)]
 pub struct BTree<K, V> {
-    priv root: Node<K, V>,
-    priv len: uint,
-    priv lower_bound: uint,
-    priv upper_bound: uint
+    root: Node<K, V>,
+    len: uint,
+    lower_bound: uint,
+    upper_bound: uint
 }
 
 impl<K: TotalOrd, V> BTree<K, V> {