[tests] Entrypoints arn't implicity exported

Author: PaulBone

tests/modules/entrypoint_1.build

@@ -0,0 +1,9 @@
+# This is free and unencumbered software released into the public domain.
+# See ../LICENSE.unlicense
+
+# PLZTEST type compile_failure 
+
+[Entrypoint_1]
+type = program
+modules = [Entrypoint1a, Entrypoint1b]
+

tests/modules/entrypoint_1.exp

@@ -0,0 +1,6 @@
+A compilation error occured and this error is not handled gracefully
+by the Plasma compiler. Sorry.
+Message:            Unknown symbol: T1a.test1a
+Context:            ../entrypoint_1b.p:14
+plzc location:      predicate `pre.from_ast.ast_to_pre_expr_2'/7
+plzc file:          pre.from_ast.m

tests/modules/entrypoint_1a.p

@@ -0,0 +1,16 @@
+/*
+ * vim: ft=plasma
+ * This is free and unencumbered software released into the public domain.
+ * See ../LICENSE.unlicense
+ */
+
+module Entrypoint1a
+
+// Function is not exported.
+entrypoint
+func test1a() uses IO -> Int {
+    print!("Test 1\n")
+
+    return 0
+}
+

tests/modules/entrypoint_1b.p

@@ -0,0 +1,16 @@
+/*
+ * vim: ft=plasma
+ * This is free and unencumbered software released into the public domain.
+ * See ../LICENSE.unlicense
+ */
+
+module Entrypoint1b
+
+import Entrypoint1a as T1a
+
+func test1b() uses IO -> Int {
+    // Call should fail because although test2a is an entrypoin it is not
+    // exported.
+    return T1a.test1a!()
+}
+