--- old/src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler.properties	2017-11-09 15:06:29.989473391 -0800
+++ new/src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler.properties	2017-11-09 15:06:29.589455930 -0800
@@ -1183,9 +1183,6 @@
 compiler.err.unsupported.encoding=\
     unsupported encoding: {0}
 
-compiler.err.io.exception=\
-    error reading source file: {0}
-
 # 0: name
 compiler.err.undef.label=\
     undefined label: {0}