RA22-015: Add test for calls to non callable entities

testsuite/tests/contrib/lkt_semantic/call_non_callable/test.lkt

@@ -0,0 +1,7 @@
+# Error for trying to call a non callable
+
+val a: (Int) -> Int = null
+@invalid val b: Int = a(12)()
+
+fun c(i: Int): Int = i + 2
+@invalid val d: Int = a(12)()

testsuite/tests/contrib/lkt_semantic/call_non_callable/test.out

@@ -0,0 +1,73 @@
+Resolving test.lkt
+==================
+Id   <RefId "Int" test.lkt:3:9-3:12>
+     references <StructDecl prelude: "Int">
+
+Id   <RefId "Int" test.lkt:3:17-3:20>
+     references <StructDecl prelude: "Int">
+
+Expr <NullLit test.lkt:3:23-3:27>
+     has type <FunctionType prelude: "(Int) -> Int">
+
+Id   <RefId "Int" test.lkt:4:17-4:20>
+     references <StructDecl prelude: "Int">
+
+test.lkt:4:23: error: Object of type `Int` is not callable
+3 | @invalid val b: Int = a(12)()
+  |                       ^^^^^  
+
+Id   <RefId "a" test.lkt:4:23-4:24>
+     references <ValDecl "a" test.lkt:3:1-3:27>
+
+Expr <RefId "a" test.lkt:4:23-4:24>
+     has type <FunctionType prelude: "(Int) -> Int">
+
+Expr <NumLit test.lkt:4:25-4:27>
+     has type <StructDecl prelude: "Int">
+
+Expr <CallExpr test.lkt:4:23-4:28>
+     has type <StructDecl prelude: "Int">
+
+Expr <CallExpr test.lkt:4:23-4:30>
+     has type <StructDecl prelude: "Int">
+
+Id   <RefId "Int" test.lkt:6:10-6:13>
+     references <StructDecl prelude: "Int">
+
+Id   <RefId "Int" test.lkt:6:16-6:19>
+     references <StructDecl prelude: "Int">
+
+Id   <RefId "i" test.lkt:6:22-6:23>
+     references <FunArgDecl "i" test.lkt:6:7-6:13>
+
+Expr <RefId "i" test.lkt:6:22-6:23>
+     has type <StructDecl prelude: "Int">
+
+Expr <NumLit test.lkt:6:26-6:27>
+     has type <StructDecl prelude: "Int">
+
+Expr <BinOp test.lkt:6:22-6:27>
+     has type <StructDecl prelude: "Int">
+
+Id   <RefId "Int" test.lkt:7:17-7:20>
+     references <StructDecl prelude: "Int">
+
+test.lkt:7:23: error: Object of type `Int` is not callable
+6 | @invalid val d: Int = a(12)()
+  |                       ^^^^^  
+
+Id   <RefId "a" test.lkt:7:23-7:24>
+     references <ValDecl "a" test.lkt:3:1-3:27>
+
+Expr <RefId "a" test.lkt:7:23-7:24>
+     has type <FunctionType prelude: "(Int) -> Int">
+
+Expr <NumLit test.lkt:7:25-7:27>
+     has type <StructDecl prelude: "Int">
+
+Expr <CallExpr test.lkt:7:23-7:28>
+     has type <StructDecl prelude: "Int">
+
+Expr <CallExpr test.lkt:7:23-7:30>
+     has type <StructDecl prelude: "Int">
+

testsuite/tests/contrib/lkt_semantic/call_non_callable/test.yaml

@@ -0,0 +1 @@
+driver: lkt