Avoid dead code warnings for users of async. #132
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Don't bother adding `{ ...; () }` if we can use the original tree(s) instead,
e.g. if the last tree in `...` conforms to `Unit`.
This makes the debug output of the macro a little easier to read.
If we blindly splicing `{..$stats, ..$generatedCode}`, and the last
expression in `$stats` is of type `Nothing`, we'll incur a dead
code warning when typechecking the block.
This commit:
- introduces a helper method to augment user-written stats with
synthetic code
- Emit a try/finally in that code (so we advance the state, even if we
are about to exit the state machine in the async-block global
exception handler
- Hide `Nothing` typed expressions from the dead code analysis
by wrapping them in an `expr: Any`
Fixes scala#150 (the part reported in the comments, not the original ticket.)
By declararing the parameter of `async` as by-name. Fixes scala#150 (the bug in the original ticket.)
This avoids leaving .class files in the working directory after running the test.
And remove unused code.
retronym
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Jul 30, 2015
Avoid dead code warnings for users of async.
|
This fixes #105 (rather than 150, as incorrectly claimed in the commit comments.) |
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