576 - helper for printing integers

This requires creating a new data structure called buffer, because
strings are too inefficient for appending to, and we need to know how
long they need to be before we clear them.

But I'm not gonna bother to write tests for all the new primitives I
just introduced, because that's not expedient.

One test for mu is how nicely it handles situations like this without
requiring perfect test hygiene. In this case, I can imagine tools that
will extract tests for a particular function out of all known tests.
Especially if it's a pure function that should be easy. Then just show
each test to the programmer and ask him to give it a reasonable name.

1 files changed, 4 insertions, 0 deletions

diff --git a/horizon b/horizon
index a8869da4..f46e56ec 100644
--- a/horizon
+++ b/horizon
@@ -23,3 +23,7 @@ Trace should contain [
   typed "b"
   typed "c"
 ]
+
+---
+
+Extract unit tests for helper out of all existing tests.