Kotlin: Add test case for overloaded array get

Author: tamasvajk

java/ql/test/kotlin/library-tests/operator-overloads/PrintAst.expected

@@ -0,0 +1,56 @@
+test.kt:
+#    0| [CompilationUnit] test
+#    0|   1: [Class] TestKt
+#    1|     1: [Method] fn
+#    1|       3: [TypeAccess] Unit
+#-----|       4: (Parameters)
+#    1|         0: [Parameter] arr
+#    1|           0: [TypeAccess] byte[]
+#    1|         1: [Parameter] mt
+#    1|           0: [TypeAccess] C
+#    1|       5: [BlockStmt] { ... }
+#    2|         0: [ExprStmt] <Expr>;
+#    2|           0: [ImplicitCoercionToUnitExpr] <implicit coercion to unit>
+#    2|             0: [TypeAccess] Unit
+#    2|             1: [ArrayAccess] ...[...]
+#    2|               0: [VarAccess] arr
+#    2|               1: [IntegerLiteral] 1
+#    3|         1: [ExprStmt] <Expr>;
+#    3|           0: [ImplicitCoercionToUnitExpr] <implicit coercion to unit>
+#    3|             0: [TypeAccess] Unit
+#    3|             1: [ArrayAccess] ...[...]
+#    3|               1: [IntegerLiteral] 1
+#    4|         2: [ExprStmt] <Expr>;
+#    4|           0: [ImplicitCoercionToUnitExpr] <implicit coercion to unit>
+#    4|             0: [TypeAccess] Unit
+#    4|             1: [MethodAccess] get(...)
+#    4|               -1: [VarAccess] mt
+#    4|               0: [IntegerLiteral] 1
+#    4|               1: [IntegerLiteral] 2
+#    7|     2: [ExtensionMethod] get
+#    7|       3: [TypeAccess] String
+#-----|       4: (Parameters)
+#    7|         0: [Parameter] <this>
+#    7|           0: [TypeAccess] byte[]
+#    7|         1: [Parameter] i
+#    7|           0: [TypeAccess] int
+#    7|         2: [Parameter] j
+#    7|           0: [TypeAccess] int
+#    7|       5: [BlockStmt] { ... }
+#    7|         0: [ReturnStmt] return ...
+#    7|           0: [StringLiteral] 
+#   10|   2: [Class] C
+#   10|     1: [Constructor] C
+#   10|       5: [BlockStmt] { ... }
+#   10|         0: [SuperConstructorInvocationStmt] super(...)
+#   10|         1: [BlockStmt] { ... }
+#   11|     2: [Method] get
+#   11|       3: [TypeAccess] String
+#-----|       4: (Parameters)
+#   11|         0: [Parameter] i
+#   11|           0: [TypeAccess] int
+#   11|         1: [Parameter] j
+#   11|           0: [TypeAccess] int
+#   11|       5: [BlockStmt] { ... }
+#   11|         0: [ReturnStmt] return ...
+#   11|           0: [StringLiteral] 

java/ql/test/kotlin/library-tests/operator-overloads/PrintAst.qlref

@@ -0,0 +1 @@
+semmle/code/java/PrintAst.ql

java/ql/test/kotlin/library-tests/operator-overloads/test.expected

@@ -0,0 +1,2 @@
+| test.kt:3:5:3:13 | Dispatch receiver not found |
+| test.kt:3:5:3:13 | Extra arguments found |

java/ql/test/kotlin/library-tests/operator-overloads/test.kt

@@ -0,0 +1,12 @@
+fun fn(arr: ByteArray, mt: C) {
+    arr[1]
+    arr[1, 2]
+    mt[1, 2]
+}
+
+public operator fun ByteArray.get(i: Int, j: Int) = ""
+
+
+public class C {
+    public operator fun get(i: Int, j: Int) = ""
+}

java/ql/test/kotlin/library-tests/operator-overloads/test.ql

@@ -0,0 +1,6 @@
+import java
+import java
+import semmle.code.java.Diagnostics
+
+from Diagnostic d
+select d