Add problematic multiunit test case from #49

generator/multiunit_test.go

@@ -0,0 +1,28 @@
+package generator
+
+import "testing"
+
+func TestUnitWriterInterface (test *testing.T) {
+testUnits (test,
+`
+`,
+`[sayHello writer:io::Writer] = writer.[write 'well hello their\n']
+
+[main]: I32 'main' = {
+	stdout:io::File = 1
+	[sayHello stdout]
+	0
+}`,
+
+"cstdio.fspl",
+`+ FileDescriptor: Int
++ [write file:FileDescriptor buffer:*Byte count:Index]: Index 'write'`,
+
+"io.fspl",
+`+ Writer: (~ [write buffer:*:Byte]: Index)
++ File: cstdio::FileDescriptor
++ File.[write buffer:*:Byte]:Index =
+	cstdio::[write
+		[~cstdio::FileDescriptor [.this]]
+		[~*Byte buffer] [#buffer]]`,
+)}