Cleanup the subclasses of FeatureMatcher which are currently try-catch-ing

Author: alb-i986

hamcrest/src/main/java/org/hamcrest/FeatureMatcher.java

@@ -33,7 +33,7 @@ public FeatureMatcher(Matcher<? super U> subMatcher, String featureDescription,
    * @param actual the target object
    * @return the feature to be matched
    */
-  protected abstract U featureValueOf(T actual);
+  protected abstract U featureValueOf(T actual) throws Exception;
 
   @Override
   protected boolean matchesSafely(T actual, Description mismatch) {

hamcrest/src/main/java/org/hamcrest/io/FileMatchers.java

@@ -50,12 +50,8 @@ public static Matcher<File> aFileNamed(final Matcher<String> expected) {
 
     public static Matcher<File> aFileWithCanonicalPath(final Matcher<String> expected) {
         return new FeatureMatcher<File, String>(expected, "A file with canonical path", "path") {
-            @Override protected String featureValueOf(File actual) {
-                try {
-                    return actual.getCanonicalPath();
-                } catch (IOException e) {
-                    return "Exception: " + e.getMessage();
-                }
+            @Override protected String featureValueOf(File actual) throws IOException {
+                return actual.getCanonicalPath();
             }
         };
     }