diff --git a/src/core/demangle.d b/src/core/demangle.d
index 3a58c21461..aef562601c 100644
--- a/src/core/demangle.d
+++ b/src/core/demangle.d
@@ -923,7 +923,6 @@ pure @safe:
             return dst[beg .. len];
         case 'F': case 'U': case 'W': case 'V': case 'R': // TypeFunction
             return parseTypeFunction( name );
-        case 'I': // TypeIdent (I LName)
         case 'C': // TypeClass (C LName)
         case 'S': // TypeStruct (S LName)
         case 'E': // TypeEnum (E LName)
@@ -1241,6 +1240,11 @@ pure @safe:
             }
             switch ( front )
             {
+            case 'I': // in  (I Type)
+                popFront();
+                put("in ");
+                parseType();
+                continue;
             case 'J': // out (J Type)
                 popFront();
                 put( "out " );
@@ -2437,6 +2441,7 @@ else
         ["printf", "printf"],
         ["_foo", "_foo"],
         ["_D88", "_D88"],
+        ["_D3fooQeFIAyaZv", "void foo.foo(in immutable(char)[])" ],
         ["_D4test3fooAa", "char[] test.foo"],
         ["_D8demangle8demangleFAaZAa", "char[] demangle.demangle(char[])"],
         ["_D6object6Object8opEqualsFC6ObjectZi", "int object.Object.opEquals(Object)"],