Rollup merge of rust-lang#25200 - nham:E0062_E0063, r=alexcrichton

cc rust-lang#24407

Author: Manishearth

src/librustc/diagnostics.rs

@@ -271,6 +271,12 @@ fn main() {
 See also http://doc.rust-lang.org/book/unsafe.html
 "##,
 
+E0137: r##"
+This error indicates that the compiler found multiple functions with the
+#[main] attribute. This is an error because there must be a unique entry point
+into a Rust program.
+"##,
+
 E0152: r##"
 Lang items are already implemented in the standard library. Unless you are
 writing a free-standing application (e.g. a kernel), you do not need to provide
@@ -800,7 +806,6 @@ register_diagnostics! {
     E0134,
     E0135,
     E0136,
-    E0137,
     E0138,
     E0139,
     E0261, // use of undeclared lifetime name

src/librustc_typeck/diagnostics.rs

@@ -34,6 +34,18 @@ let x_is_nonzero = x as bool;
 ```
 "##,
 
+E0062: r##"
+This error indicates that during an attempt to build a struct or struct-like
+enum variant, one of the fields was specified more than once. Each field should
+be specified exactly one time.
+"##,
+
+E0063: r##"
+This error indicates that during an attempt to build a struct or struct-like
+enum variant, one of the fields was not provided. Each field should be specified
+exactly once.
+"##,
+
 E0081: r##"
 Enum discriminants are used to differentiate enum variants stored in memory.
 This error indicates that the same value was used for two or more variants,
@@ -136,8 +148,6 @@ register_diagnostics! {
     E0059,
     E0060,
     E0061,
-    E0062,
-    E0063,
     E0066,
     E0067,
     E0068,