Fix test to check help message as well

Author: hkmatsumoto

src/test/ui/suggestions/field-access.fixed

@@ -12,15 +12,12 @@ enum B {
 
 fn main() {
     let a = A { b: B::Fst };
-    if let B::Fst = a.b {};
-    //~^ ERROR mismatched types [E0308]
-    // note: you might have meant to use field `b` of type `B`
+    if let B::Fst = a.b {}; //~ ERROR mismatched types [E0308]
+    //~^ HELP you might have meant to use field `b` of type `B`
     match a.b {
-        B::Fst => (),
-        B::Snd => (),
+        //~^ HELP you might have meant to use field `b` of type `B`
+        //~| HELP you might have meant to use field `b` of type `B`
+        B::Fst => (), //~ ERROR mismatched types [E0308]
+        B::Snd => (), //~ ERROR mismatched types [E0308]
     }
-    //~^^^ ERROR mismatched types [E0308]
-    // note: you might have meant to use field `b` of type `B`
-    //~^^^^ ERROR mismatched types [E0308]
-    // note: you might have meant to use field `b` of type `B`
 }

src/test/ui/suggestions/field-access.rs

@@ -12,15 +12,12 @@ enum B {
 
 fn main() {
     let a = A { b: B::Fst };
-    if let B::Fst = a {};
-    //~^ ERROR mismatched types [E0308]
-    // note: you might have meant to use field `b` of type `B`
+    if let B::Fst = a {}; //~ ERROR mismatched types [E0308]
+    //~^ HELP you might have meant to use field `b` of type `B`
     match a {
-        B::Fst => (),
-        B::Snd => (),
+        //~^ HELP you might have meant to use field `b` of type `B`
+        //~| HELP you might have meant to use field `b` of type `B`
+        B::Fst => (), //~ ERROR mismatched types [E0308]
+        B::Snd => (), //~ ERROR mismatched types [E0308]
     }
-    //~^^^ ERROR mismatched types [E0308]
-    // note: you might have meant to use field `b` of type `B`
-    //~^^^^ ERROR mismatched types [E0308]
-    // note: you might have meant to use field `b` of type `B`
 }

src/test/ui/suggestions/field-access.stderr

@@ -15,13 +15,14 @@ LL |     if let B::Fst = a.b {};
    |                     ^^^
 
 error[E0308]: mismatched types
-  --> $DIR/field-access.rs:19:9
+  --> $DIR/field-access.rs:20:9
    |
 LL |     Fst,
    |     --- unit variant defined here
 ...
 LL |     match a {
    |           - this expression has type `A`
+...
 LL |         B::Fst => (),
    |         ^^^^^^ expected struct `A`, found enum `B`
    |
@@ -31,14 +32,14 @@ LL |     match a.b {
    |           ^^^
 
 error[E0308]: mismatched types
-  --> $DIR/field-access.rs:20:9
+  --> $DIR/field-access.rs:21:9
    |
 LL |     Snd,
    |     --- unit variant defined here
 ...
 LL |     match a {
    |           - this expression has type `A`
-LL |         B::Fst => (),
+...
 LL |         B::Snd => (),
    |         ^^^^^^ expected struct `A`, found enum `B`
    |