[Dana] Add some valid and invalid programs (#87)

* Add some invalid programs (directory structure needs to become flat)

* Add some correct programs together with inputs and results

---------

Co-authored-by: Kostis Sagonas <kostis@cs.ntua.gr>

Author: JohnnyPol

dana/programs-erroneous/invalid_parser/assign_error.dana

@@ -0,0 +1,2 @@
+def main
+    x = 1

dana/programs-erroneous/invalid_parser/elif_without_if.dana

@@ -0,0 +1,7 @@
+# Error: 'elif' used without a preceding 'if'
+
+def main
+    begin
+        elif condition
+            writeString: "This should never be reached"
+    end

dana/programs-erroneous/invalid_parser/grammar_error.dana

@@ -0,0 +1,2 @@
+def hello (writeInteger)
+  writeString: "Hello world!\n"

dana/programs-erroneous/invalid_parser/missing_colon_in_call.dana

@@ -0,0 +1,4 @@
+# Error: missing ':' in function call syntax
+
+def main
+    writeString "Hello without a colon"

dana/programs-erroneous/invalid_parser/missing_end_for_begin.dana

@@ -0,0 +1,5 @@
+# Error: 'begin' block is never closed with 'end'
+
+def main
+    begin
+        writeString: "Hello from an unclosed block"

dana/programs-erroneous/invalid_semantic/call_to_undefined_function.dana

@@ -0,0 +1,6 @@
+# Error: call to undefined function 'printInt'
+
+def main
+    begin
+        printInt: 42
+    end

dana/programs-erroneous/invalid_semantic/invalid_break_use.dana

@@ -0,0 +1,3 @@
+def main
+  break             # Error: break outside loop
+  return: 42

dana/programs-erroneous/invalid_semantic/invalid_continue_use.dana

@@ -0,0 +1,3 @@
+def main
+  continue          # Error: continue outside loop
+  return: 42

dana/programs-erroneous/invalid_semantic/non_boolean_if_condition.dana

@@ -0,0 +1,5 @@
+# Error: 'if' condition is not boolean (string used as condition)
+
+def main
+    if "not a boolean":
+        writeString: "erroneous"

dana/programs-erroneous/invalid_semantic/scope_error.dana

@@ -0,0 +1,9 @@
+# Error: use of variable 'x' outside its scope (declared inside nested def 'inner')
+
+def main
+    var y is int
+
+    def inner
+        var x is int
+        x := 42
+    y := x