test(import): multiple imports from the same schema id (#3)

schema/import/import_types.isl

@@ -0,0 +1,35 @@
+schema_header::{
+  imports: [
+    { id: "schema/import/abcde.isl", type: a, as: a2 },
+    { id: "schema/util/positive_int.isl" },
+    { id: "schema/import/abcde.isl", type: b },
+    { id: "schema/util/positive_int.isl", type: positive_int, as: posint },
+    { id: "schema/import/abcde.isl", type: c, as: c2 },
+  ],
+}
+type::{
+  name: import_types_test,
+  type: struct,
+  fields: {
+    a2: a2,
+    positive_int: positive_int,
+    b: b,
+    posint: posint,
+    c2: c2,
+  },
+}
+schema_footer::{
+}
+
+valid::[
+  { a: a, positive_int: 5, b: b, posint: 6, c: c },
+]
+
+invalid::[
+  { a: b, positive_int:  5, b: b, posint:  6, c: c },
+  { a: a, positive_int: -1, b: b, posint:  6, c: c },
+  { a: a, positive_int:  5, b: a, posint:  6, c: c },
+  { a: a, positive_int:  5, b: b, posint: -1, c: c },
+  { a: a, positive_int:  5, b: b, posint:  6, c: b },
+]
+