Update lib.rs

Update lib.rs
Update lib.rs
Update E0438.rs
Update E0437.rs
Update E0435.rs

Author: shyamsundarb-arch

src/librustc_resolve/lib.rs

@@ -251,20 +251,24 @@ fn resolve_struct_error<'b, 'a: 'b, 'c>(resolver: &'b Resolver<'a>,
             err
         }
         ResolutionError::TypeNotMemberOfTrait(type_, trait_) => {
-            struct_span_err!(resolver.session,
+            let mut err = struct_span_err!(resolver.session,
                              span,
                              E0437,
                              "type `{}` is not a member of trait `{}`",
                              type_,
-                             trait_)
+                             trait_);
+            err.span_label(span, &format!("not a member of trait `Foo`"));
+            err
         }
         ResolutionError::ConstNotMemberOfTrait(const_, trait_) => {
-            struct_span_err!(resolver.session,
+            let mut err = struct_span_err!(resolver.session,
                              span,
                              E0438,
                              "const `{}` is not a member of trait `{}`",
                              const_,
-                             trait_)
+                             trait_);
+            err.span_label(span, &format!("not a member of trait `Foo`"));
+            err
         }
         ResolutionError::VariableNotBoundInPattern(variable_name, from, to) => {
             struct_span_err!(resolver.session,
@@ -438,10 +442,12 @@ fn resolve_struct_error<'b, 'a: 'b, 'c>(resolver: &'b Resolver<'a>,
                               closure form instead")
         }
         ResolutionError::AttemptToUseNonConstantValueInConstant => {
-            struct_span_err!(resolver.session,
+            let mut err = struct_span_err!(resolver.session,
                              span,
                              E0435,
-                             "attempt to use a non-constant value in a constant")
+                             "attempt to use a non-constant value in a constant");
+            err.span_label(span, &format!("non-constant used with constant"));
+            err
         }
         ResolutionError::BindingShadowsSomethingUnacceptable(what_binding, name, binding) => {
             let shadows_what = PathResolution::new(binding.def().unwrap()).kind_name();

src/test/compile-fail/E0435.rs

@@ -11,4 +11,5 @@
 fn main () {
     let foo = 42u32;
     const FOO : u32 = foo; //~ ERROR E0435
+    //~| NOTE non-constant used with constant
 }

src/test/compile-fail/E0437.rs

@@ -12,6 +12,7 @@ trait Foo {}
 
 impl Foo for i32 {
     type Bar = bool; //~ ERROR E0437
+    //~| NOTE not a member of trait `Foo`
 }
 
 fn main () {

src/test/compile-fail/E0438.rs

@@ -14,6 +14,7 @@ trait Foo {}
 
 impl Foo for i32 {
     const BAR: bool = true; //~ ERROR E0438
+        //~| NOTE not a member of trait `Foo`
 }
 
 fn main () {