Merge pull request #9806 from igfoo/igfoo/useType

Kotlin: Extract an ErrorType if we fail to correctly extract a type

java/ql/lib/semmle/code/Location.qll

@@ -47,6 +47,8 @@ predicate hasName(Element e, string name) {
   kt_type_alias(e, name, _)
   or
   ktProperties(e, name)
+  or
+  e instanceof ErrorType and name = "<CodeQL error type>"
 }
 
 /**

java/ql/lib/semmle/code/java/Type.qll

@@ -666,6 +666,14 @@ class RefType extends Type, Annotatable, Modifiable, @reftype {
   }
 }
 
+/**
+ * An `ErrorType` is generated when CodeQL is unable to correctly
+ * extract a type.
+ */
+class ErrorType extends RefType, @errortype {
+  override string getAPrimaryQlClass() { result = "ErrorType" }
+}
+
 /** A type that is the same as its source declaration. */
 class SrcRefType extends RefType {
   SrcRefType() { this.isSourceDeclaration() }