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4. Constraints

• Restrain dependencies to the most portable part of the compiler (tests should work as quickly as possible even when OCaml is ported to a new platform)
• In particular, use neither Unix nor Str
• No dependency on OCaml tools not distributed with the compiler

Design principle: the more common the test is, the simpler it should be to write it

One common test: compile, run, check exit code is 0 and program output is empty.