3.1.7  Release 5.3.0

Version 2011-10-01-06.01.04

First parallel-compiles release behaved badly on compile errors; this is basically Parallel Compiles Take Two. I also almost completely rewrote the src/lib/std/src/posix/spawn–premicrothread.api api per suggestion from Joe Wells.

As before, if parallel compiles act up, they can be disabled by setting compile_in_subprocesses to FALSE in src/lib/compiler/toplevel/main/compiler-controls.pkg and recompiling, or doing

eval:  set_control "compiler::compile_in_subprocesses"  "FALSE";

at the Mythryl interactive prompt.

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