fix various error messages

Author: nikomatsakis

src/test/compile-fail/derived-errors/issue-31997-1.rs

@@ -29,7 +29,6 @@ fn main() {
 
     let mut map = HashMap::new();
     //~^ ERROR E0433
-    //~| ERROR E0425
 
     for line in input.lines() {
         let line = line.unwrap();

src/test/compile-fail/issue-13853.rs

@@ -35,7 +35,7 @@ impl Node for Stuff {
 
 fn iterate<N: Node, G: Graph<N>>(graph: &G) {
     for node in graph.iter() { //~ ERROR no method named `iter` found
-        node.zomg();  //~ error: the type of this value must be known in this context
+        node.zomg();
     }
 }
 

src/test/compile-fail/issue-19692.rs

@@ -12,7 +12,7 @@ struct Homura;
 
 fn akemi(homura: Homura) {
     let Some(ref madoka) = Some(homura.kaname()); //~ ERROR no method named `kaname` found
-    madoka.clone(); //~ ERROR the type of this value must be known
+    madoka.clone();
 }
 
 fn main() { }

src/test/compile-fail/issue-20261.rs

@@ -11,6 +11,5 @@
 fn main() {
     for (ref i,) in [].iter() { //~ ERROR mismatched types
         i.clone();
-        //~^ ERROR: the type of this value must be known in this context
     }
 }

src/test/compile-fail/issue-26480.rs

@@ -30,7 +30,7 @@ macro_rules! write {
 }
 
 macro_rules! cast {
-    ($x:expr) => ($x as ())
+    ($x:expr) => ($x as ()) //~ ERROR non-scalar cast
 }
 
 fn main() {
@@ -39,4 +39,5 @@ fn main() {
     //~^ NOTE in this expansion of write!
 
     cast!(2);
+    //~^ NOTE in this expansion of cast!
 }

src/test/compile-fail/issue-3973.rs

@@ -31,5 +31,5 @@ impl ToString_ for Point {
 fn main() {
     let p = Point::new(0.0, 0.0);
     //~^ ERROR no associated item named `new` found for type `Point` in the current scope
-    println!("{}", p.to_string()); //~ ERROR type of this value must be known
+    println!("{}", p.to_string());
 }

src/test/compile-fail/issue-7092.rs

@@ -19,7 +19,7 @@ fn foo(x: Whatever) {
 //~| found `std::option::Option<_>`
 //~| expected enum `Whatever`
 //~| found enum `std::option::Option`
-            field.access(), //~ ERROR the type of this value must be known in this context
+            field.access(),
     }
 }