[fixes #1553] attriber of JDK9 checks the enclosing class’s type, which we intentionally haven’t set yet. To avoid NPEs, let’s set it.

src/core/lombok/javac/JavacResolution.java

@@ -222,6 +222,11 @@ public class JavacResolution {
 	}
 	
 	private void attrib(JCTree tree, Env<AttrContext> env) {
+		if (env.enclClass.type == null) try {
+			env.enclClass.type = Type.noType;
+		} catch (Throwable ignore) {
+			// This addresses issue #1553 which involves JDK9; if it doesn't exist, we probably don't need to set it.
+		}
 		if (tree instanceof JCBlock) attr.attribStat(tree, env);
 		else if (tree instanceof JCMethodDecl) attr.attribStat(((JCMethodDecl) tree).body, env);
 		else if (tree instanceof JCVariableDecl) attr.attribStat(tree, env);