--- a/langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Attr.java	Thu Mar 02 21:16:18 2017 +0000
+++ b/langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Attr.java	Fri Mar 03 09:58:11 2017 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -4965,6 +4965,9 @@
                 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
                 that.sym.adr = 0;
             }
+            if (that.vartype == null) {
+                that.vartype = make.Erroneous();
+            }
             super.visitVarDef(that);
         }
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/T8175790/NPEDueToErroneousLambdaTest.java	Fri Mar 03 09:58:11 2017 -0800
@@ -0,0 +1,29 @@
+/*
+ * @test /nodynamiccopyright/
+ * @bug 8175790
+ * @summary field JCVariableDecl.vartype can't be null after post attribution analysis
+ * @compile/fail/ref=NPEDueToErroneousLambdaTest.out -XDrawDiagnostics NPEDueToErroneousLambdaTest.java
+ */
+
+import java.util.List;
+import java.util.function.Function;
+
+public abstract class NPEDueToErroneousLambdaTest {
+
+    interface R {}
+    interface A {}
+    interface S {}
+
+    abstract <I, O> Function<I, O> p(final Function<I, O> function);
+    abstract <I, O> List<O> t(Function<? super I, ? extends O> function);
+
+    public void f() {
+        t(p(new Function<A, Object>() {
+            public List<Object> apply(A a) throws Exception {
+                return t((Function<R, S>)input -> {
+                        return t(p((Function<Boolean, S>) i -> null), null);
+                });
+            }
+        }));
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/T8175790/NPEDueToErroneousLambdaTest.out	Fri Mar 03 09:58:11 2017 -0800
@@ -0,0 +1,3 @@
+NPEDueToErroneousLambdaTest.java:22:33: compiler.err.override.meth.doesnt.throw: (compiler.misc.cant.implement: apply(NPEDueToErroneousLambdaTest.A), compiler.misc.anonymous.class: NPEDueToErroneousLambdaTest$1, apply(T), java.util.function.Function), java.lang.Exception
+NPEDueToErroneousLambdaTest.java:24:32: compiler.err.cant.apply.symbol: kindname.method, t, java.util.function.Function<? super I,? extends O>, java.util.function.Function<java.lang.Boolean,NPEDueToErroneousLambdaTest.S>,compiler.misc.type.null, kindname.class, NPEDueToErroneousLambdaTest, (compiler.misc.infer.arg.length.mismatch: I,O)
+2 errors