Help fixing the tests on FreeBSD armv7

[asomers]

Running the tests on FreeBSD armv7 results in several failurse. But the error messages are uninformative. Can anybody please tell me what these mean?

RUNNING ALL TESTS
rust[1] = 221 != 1 (C): Rust "c_float" -> C
rust[2] = 191 != 2 (C): Rust "c_float" -> C
rust[3] = 191 != 3 (C): Rust "c_float" -> C
rust [1] = 254 != 1 (C): C "c_float" -> Rust
rust [2] = 253 != 2 (C): C "c_float" -> Rust
rust [3] = 252 != 3 (C): C "c_float" -> Rust
rust[4] = 188 != 4 (C): Rust "c_double" -> C
rust [0] = 255 != 42 (C): C "c_double" -> Rust
rust [1] = 254 != 1 (C): C "c_double" -> Rust
rust [2] = 253 != 2 (C): C "c_double" -> Rust
rust [3] = 252 != 3 (C): C "c_double" -> Rust
rust [4] = 251 != 4 (C): C "c_double" -> Rust
rust [5] = 250 != 5 (C): C "c_double" -> Rust
rust [6] = 249 != 6 (C): C "c_double" -> Rust
rust [7] = 248 != 7 (C): C "c_double" -> Rust