Test regression

[rami3l]

Many thanks for making this library!

However, when running cargo test --all-features --no-fail-fast with your current library, I have noticed that your 2905713 has caused the following regression:

Before

error: 1 target failed:
    `--doc`

After

error: 3 targets failed:
    `--test glifparser`
    `--test postscript`
    `--doc`

... so clearly something has gone wrong with that particular commit.

Many thanks in advance!

---

There is also another unrelated problem as shown above:

---- src/lib.rs - (line 19) stdout ----
error: cannot find macro `test_data` in this scope
 --> src/lib.rs:25:12
  |
9 | let path = test_data!();
  |            ^^^^^^^^^
error: aborting due to 1 previous error
[..]
error: 1 target failed:
    `--doc`

... which I believe is caused by cargo test trying to run your doctest:

spiro.rlib/src/lib.rs

Line 1 in c75f5d9

#![doc = include_str!("../README.md")]

[rami3l]

I have narrowed the problem down to this diff:

-pub(crate) fn mod2pi(th: f64) -> f64 {
-    let u = th / (2. * PI);
-    return 2. * PI * (u - (u + 0.5).floor());
+/// θ mod 2π
+/// mod2pi(θ) gives the value of θ within the range -π < θ ≤ π.
+pub fn mod2pi(th: f64) -> f64 {
+    return th.rem_euclid(2. * PI);
 }

... I'd like to offer a patch trying to address both problems above.