Auto merge of #57088 - euclio:non-camel-case-early-lint, r=estebank

make non_camel_case_types an early lint

This allows us to catch these kinds of style violations much earlier, as evidenced by the large number of tests that had to be updated for this change.

src/librustc_lint/lib.rs

@@ -125,6 +125,7 @@ pub fn register_builtins(store: &mut lint::LintStore, sess: Option<&Session>) {
                        UnusedDocComment,
                        BadRepr,
                        EllipsisInclusiveRangePatterns,
+                       NonCamelCaseTypes,
                        );
 
     add_early_builtin_with_new!(sess,
@@ -140,7 +141,6 @@ pub fn register_builtins(store: &mut lint::LintStore, sess: Option<&Session>) {
         UnusedAttributes: UnusedAttributes,
         PathStatements: PathStatements,
         UnusedResults: UnusedResults,
-        NonCamelCaseTypes: NonCamelCaseTypes,
         NonSnakeCase: NonSnakeCase,
         NonUpperCaseGlobals: NonUpperCaseGlobals,
         NonShorthandFieldPatterns: NonShorthandFieldPatterns,

src/librustc_lint/nonstandard_style.rs

@@ -13,8 +13,8 @@ use rustc::hir::def::Def;
 use rustc::hir::intravisit::FnKind;
 use rustc::ty;
 use rustc_target::spec::abi::Abi;
-use lint::{LateContext, LintContext, LintArray};
-use lint::{LintPass, LateLintPass};
+use lint::{EarlyContext, LateContext, LintContext, LintArray};
+use lint::{EarlyLintPass, LintPass, LateLintPass};
 use syntax::ast;
 use syntax::attr;
 use syntax_pos::Span;
@@ -50,7 +50,7 @@ declare_lint! {
 pub struct NonCamelCaseTypes;
 
 impl NonCamelCaseTypes {
-    fn check_case(&self, cx: &LateContext, sort: &str, name: ast::Name, span: Span) {
+    fn check_case(&self, cx: &EarlyContext, sort: &str, name: ast::Name, span: Span) {
         fn char_has_case(c: char) -> bool {
             c.is_lowercase() || c.is_uppercase()
         }
@@ -114,12 +114,12 @@ impl LintPass for NonCamelCaseTypes {
     }
 }
 
-impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NonCamelCaseTypes {
-    fn check_item(&mut self, cx: &LateContext, it: &hir::Item) {
+impl EarlyLintPass for NonCamelCaseTypes {
+    fn check_item(&mut self, cx: &EarlyContext, it: &ast::Item) {
         let has_repr_c = it.attrs
             .iter()
             .any(|attr| {
-                attr::find_repr_attrs(&cx.tcx.sess.parse_sess, attr)
+                attr::find_repr_attrs(&cx.sess.parse_sess, attr)
                     .iter()
                     .any(|r| r == &attr::ReprC)
             });
@@ -129,27 +129,22 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NonCamelCaseTypes {
         }
 
         match it.node {
-            hir::ItemKind::Ty(..) |
-            hir::ItemKind::Enum(..) |
-            hir::ItemKind::Struct(..) |
-            hir::ItemKind::Union(..) => self.check_case(cx, "type", it.name, it.span),
-            hir::ItemKind::Trait(..) => self.check_case(cx, "trait", it.name, it.span),
+            ast::ItemKind::Ty(..) |
+            ast::ItemKind::Enum(..) |
+            ast::ItemKind::Struct(..) |
+            ast::ItemKind::Union(..) => self.check_case(cx, "type", it.ident.name, it.span),
+            ast::ItemKind::Trait(..) => self.check_case(cx, "trait", it.ident.name, it.span),
             _ => (),
         }
     }
 
-    fn check_variant(&mut self, cx: &LateContext, v: &hir::Variant, _: &hir::Generics) {
-        self.check_case(cx, "variant", v.node.name, v.span);
+    fn check_variant(&mut self, cx: &EarlyContext, v: &ast::Variant, _: &ast::Generics) {
+        self.check_case(cx, "variant", v.node.ident.name, v.span);
     }
 
-    fn check_generic_param(&mut self, cx: &LateContext, param: &hir::GenericParam) {
-        match param.kind {
-            GenericParamKind::Lifetime { .. } => {}
-            GenericParamKind::Type { synthetic, .. } => {
-                if synthetic.is_none() {
-                    self.check_case(cx, "type parameter", param.name.ident().name, param.span);
-                }
-            }
+    fn check_generic_param(&mut self, cx: &EarlyContext, param: &ast::GenericParam) {
+        if let ast::GenericParamKind::Type { .. } = param.kind {
+            self.check_case(cx, "type parameter", param.ident.name, param.ident.span);
         }
     }
 }

src/test/ui/access-mode-in-closures.nll.stderr

@@ -1,17 +1,17 @@
 error[E0507]: cannot move out of borrowed content
-  --> $DIR/access-mode-in-closures.rs:19:15
+  --> $DIR/access-mode-in-closures.rs:18:15
    |
-LL |         match *s { sty(v) => v } //~ ERROR cannot move out
-   |               ^^       - data moved here
+LL |         match *s { S(v) => v } //~ ERROR cannot move out
+   |               ^^     - data moved here
    |               |
    |               cannot move out of borrowed content
    |               help: consider removing the `*`: `s`
    |
 note: move occurs because `v` has type `std::vec::Vec<isize>`, which does not implement the `Copy` trait
-  --> $DIR/access-mode-in-closures.rs:19:24
+  --> $DIR/access-mode-in-closures.rs:18:22
    |
-LL |         match *s { sty(v) => v } //~ ERROR cannot move out
-   |                        ^
+LL |         match *s { S(v) => v } //~ ERROR cannot move out
+   |                      ^
 
 error: aborting due to previous error
 

src/test/ui/access-mode-in-closures.rs

@@ -8,14 +8,13 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+struct S(Vec<isize>);
 
-struct sty(Vec<isize> );
-
-fn unpack<F>(_unpack: F) where F: FnOnce(&sty) -> Vec<isize> {}
+fn unpack<F>(_unpack: F) where F: FnOnce(&S) -> Vec<isize> {}
 
 fn main() {
     let _foo = unpack(|s| {
         // Test that `s` is moved here.
-        match *s { sty(v) => v } //~ ERROR cannot move out
+        match *s { S(v) => v } //~ ERROR cannot move out
     });
 }

src/test/ui/access-mode-in-closures.stderr

@@ -1,8 +1,8 @@
 error[E0507]: cannot move out of borrowed content
-  --> $DIR/access-mode-in-closures.rs:19:15
+  --> $DIR/access-mode-in-closures.rs:18:15
    |
-LL |         match *s { sty(v) => v } //~ ERROR cannot move out
-   |               ^^       - hint: to prevent move, use `ref v` or `ref mut v`
+LL |         match *s { S(v) => v } //~ ERROR cannot move out
+   |               ^^     - hint: to prevent move, use `ref v` or `ref mut v`
    |               |
    |               cannot move out of borrowed content
 

src/test/ui/assign-to-method.rs

@@ -8,24 +8,24 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-struct cat {
+struct Cat {
   meows : usize,
 
   how_hungry : isize,
 }
 
-impl cat {
+impl Cat {
     pub fn speak(&self) { self.meows += 1; }
 }
 
-fn cat(in_x : usize, in_y : isize) -> cat {
-    cat {
+fn cat(in_x : usize, in_y : isize) -> Cat {
+    Cat {
         meows: in_x,
         how_hungry: in_y
     }
 }
 
 fn main() {
-  let nyan : cat = cat(52, 99);
+  let nyan : Cat = cat(52, 99);
   nyan.speak = || println!("meow"); //~ ERROR attempted to take value of method
 }

src/test/ui/assign-to-method.stderr

@@ -1,4 +1,4 @@
-error[E0615]: attempted to take value of method `speak` on type `cat`
+error[E0615]: attempted to take value of method `speak` on type `Cat`
   --> $DIR/assign-to-method.rs:30:8
    |
 LL |   nyan.speak = || println!("meow"); //~ ERROR attempted to take value of method

src/test/ui/autoderef-full-lval.rs

@@ -10,24 +10,24 @@
 
 #![feature(box_syntax)]
 
-struct clam {
+struct Clam {
     x: Box<isize>,
     y: Box<isize>,
 }
 
-struct fish {
+struct Fish {
     a: Box<isize>,
 }
 
 fn main() {
-    let a: clam = clam{x: box 1, y: box 2};
-    let b: clam = clam{x: box 10, y: box 20};
+    let a: Clam = Clam{x: box 1, y: box 2};
+    let b: Clam = Clam{x: box 10, y: box 20};
     let z: isize = a.x + b.y;
     //~^ ERROR binary operation `+` cannot be applied to type `std::boxed::Box<isize>`
     println!("{}", z);
     assert_eq!(z, 21);
-    let forty: fish = fish{a: box 40};
-    let two: fish = fish{a: box 2};
+    let forty: Fish = Fish{a: box 40};
+    let two: Fish = Fish{a: box 2};
     let answer: isize = forty.a + two.a;
     //~^ ERROR binary operation `+` cannot be applied to type `std::boxed::Box<isize>`
     println!("{}", answer);

src/test/ui/bad/bad-method-typaram-kind.rs

@@ -12,11 +12,11 @@ fn foo<T:'static>() {
     1.bar::<T>(); //~ ERROR `T` cannot be sent between threads safely
 }
 
-trait bar {
+trait Bar {
     fn bar<T:Send>(&self);
 }
 
-impl bar for usize {
+impl Bar for usize {
     fn bar<T:Send>(&self) {
     }
 }

src/test/ui/bind-by-move/bind-by-move-neither-can-live-while-the-other-survives-3.rs

@@ -16,13 +16,13 @@ impl Drop for X {
     }
 }
 
-enum double_option<T,U> { some2(T,U), none2 }
+enum DoubleOption<T,U> { Some2(T,U), None2 }
 
 fn main() {
-    let x = double_option::some2(X { x: () }, X { x: () });
+    let x = DoubleOption::Some2(X { x: () }, X { x: () });
     match x {
-        double_option::some2(ref _y, _z) => { },
+        DoubleOption::Some2(ref _y, _z) => { },
         //~^ ERROR cannot bind by-move and by-ref in the same pattern
-        double_option::none2 => panic!()
+        DoubleOption::None2 => panic!()
     }
 }

src/test/ui/bind-by-move/bind-by-move-neither-can-live-while-the-other-survives-3.stderr

@@ -1,10 +1,10 @@
 error[E0009]: cannot bind by-move and by-ref in the same pattern
-  --> $DIR/bind-by-move-neither-can-live-while-the-other-survives-3.rs:24:38
+  --> $DIR/bind-by-move-neither-can-live-while-the-other-survives-3.rs:24:37
    |
-LL |         double_option::some2(ref _y, _z) => { },
-   |                              ------  ^^ by-move pattern here
-   |                              |
-   |                              both by-ref and by-move used
+LL |         DoubleOption::Some2(ref _y, _z) => { },
+   |                             ------  ^^ by-move pattern here
+   |                             |
+   |                             both by-ref and by-move used
 
 error: aborting due to previous error
 

src/test/ui/blind/blind-item-block-middle.rs

@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![allow(non_camel_case_types)]
+
 mod foo { pub struct bar; }
 
 fn main() {

src/test/ui/blind/blind-item-block-middle.stderr

@@ -1,5 +1,5 @@
 error[E0308]: mismatched types
-  --> $DIR/blind-item-block-middle.rs:14:9
+  --> $DIR/blind-item-block-middle.rs:16:9
    |
 LL |     let bar = 5;
    |         ^^^ expected integral variable, found struct `foo::bar`

src/test/ui/block-result/block-must-not-have-result-res.rs

@@ -8,9 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-struct r;
+struct R;
 
-impl Drop for r {
+impl Drop for R {
     fn drop(&mut self) {
         true //~  ERROR mismatched types
     }

src/test/ui/bogus-tag.rs

@@ -8,14 +8,13 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-
-enum color { rgb(isize, isize, isize), rgba(isize, isize, isize, isize), }
+enum Color { Rgb(isize, isize, isize), Rgba(isize, isize, isize, isize), }
 
 fn main() {
-    let red: color = color::rgb(255, 0, 0);
+    let red: Color = Color::Rgb(255, 0, 0);
     match red {
-      color::rgb(r, g, b) => { println!("rgb"); }
-      color::hsl(h, s, l) => { println!("hsl"); }
+      Color::Rgb(r, g, b) => { println!("rgb"); }
+      Color::Hsl(h, s, l) => { println!("hsl"); }
       //~^ ERROR no variant
     }
 }

src/test/ui/bogus-tag.stderr

@@ -1,11 +1,11 @@
-error[E0599]: no variant named `hsl` found for type `color` in the current scope
-  --> $DIR/bogus-tag.rs:18:7
+error[E0599]: no variant named `Hsl` found for type `Color` in the current scope
+  --> $DIR/bogus-tag.rs:17:7
    |
-LL | enum color { rgb(isize, isize, isize), rgba(isize, isize, isize, isize), }
-   | ---------- variant `hsl` not found here
+LL | enum Color { Rgb(isize, isize, isize), Rgba(isize, isize, isize, isize), }
+   | ---------- variant `Hsl` not found here
 ...
-LL |       color::hsl(h, s, l) => { println!("hsl"); }
-   |       ^^^^^^^^^^^^^^^^^^^ variant not found in `color`
+LL |       Color::Hsl(h, s, l) => { println!("hsl"); }
+   |       ^^^^^^^^^^^^^^^^^^^ variant not found in `Color`
 
 error: aborting due to previous error
 

src/test/ui/borrowck/borrowck-assign-comp.ast.nll.stderr

@@ -15,7 +15,7 @@ error[E0506]: cannot assign to `p` because it is borrowed
    |
 LL |     let q = &p.y;
    |             ---- borrow of `p` occurs here
-LL |     p = point {x: 5, y: 7};//[ast]~ ERROR cannot assign to `p`
+LL |     p = Point {x: 5, y: 7};//[ast]~ ERROR cannot assign to `p`
    |     ^^^^^^^^^^^^^^^^^^^^^^ assignment to borrowed `p` occurs here
 ...
 LL |     *q; // stretch loan

src/test/ui/borrowck/borrowck-assign-comp.ast.stderr

@@ -12,7 +12,7 @@ error[E0506]: cannot assign to `p` because it is borrowed
    |
 LL |     let q = &p.y;
    |              --- borrow of `p` occurs here
-LL |     p = point {x: 5, y: 7};//[ast]~ ERROR cannot assign to `p`
+LL |     p = Point {x: 5, y: 7};//[ast]~ ERROR cannot assign to `p`
    |     ^^^^^^^^^^^^^^^^^^^^^^ assignment to borrowed `p` occurs here
 
 error[E0506]: cannot assign to `p.y` because it is borrowed

src/test/ui/borrowck/borrowck-assign-comp.mir.stderr

@@ -15,7 +15,7 @@ error[E0506]: cannot assign to `p` because it is borrowed
    |
 LL |     let q = &p.y;
    |             ---- borrow of `p` occurs here
-LL |     p = point {x: 5, y: 7};//[ast]~ ERROR cannot assign to `p`
+LL |     p = Point {x: 5, y: 7};//[ast]~ ERROR cannot assign to `p`
    |     ^^^^^^^^^^^^^^^^^^^^^^ assignment to borrowed `p` occurs here
 ...
 LL |     *q; // stretch loan

src/test/ui/borrowck/borrowck-assign-comp.rs

@@ -11,10 +11,10 @@
 // revisions: ast mir
 //[mir]compile-flags: -Z borrowck=mir
 
-struct point { x: isize, y: isize }
+struct Point { x: isize, y: isize }
 
 fn a() {
-    let mut p = point {x: 3, y: 4};
+    let mut p = Point {x: 3, y: 4};
     let q = &p;
 
     // This assignment is illegal because the field x is not
@@ -29,9 +29,9 @@ fn c() {
     // this is sort of the opposite.  We take a loan to the interior of `p`
     // and then try to overwrite `p` as a whole.
 
-    let mut p = point {x: 3, y: 4};
+    let mut p = Point {x: 3, y: 4};
     let q = &p.y;
-    p = point {x: 5, y: 7};//[ast]~ ERROR cannot assign to `p`
+    p = Point {x: 5, y: 7};//[ast]~ ERROR cannot assign to `p`
                            //[mir]~^ ERROR cannot assign to `p` because it is borrowed
     p.x; // silence warning
     *q; // stretch loan
@@ -41,7 +41,7 @@ fn d() {
     // just for completeness's sake, the easy case, where we take the
     // address of a subcomponent and then modify that subcomponent:
 
-    let mut p = point {x: 3, y: 4};
+    let mut p = Point {x: 3, y: 4};
     let q = &p.y;
     p.y = 5; //[ast]~ ERROR cannot assign to `p.y`
              //[mir]~^ ERROR cannot assign to `p.y` because it is borrowed

src/test/ui/borrowck/borrowck-borrowed-uniq-rvalue-2.nll.stderr

@@ -1,7 +1,7 @@
 error[E0716]: temporary value dropped while borrowed
-  --> $DIR/borrowck-borrowed-uniq-rvalue-2.rs:32:20
+  --> $DIR/borrowck-borrowed-uniq-rvalue-2.rs:30:20
    |
-LL |     let x = defer(&vec!["Goodbye", "world!"]);
+LL |     let x = defer(&vec!["Goodbye", "world!"]); //~ ERROR borrowed value does not live long enough
    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^ - temporary value is freed at the end of this statement
    |                    |
    |                    creates a temporary which is freed while still in use