Fix an ICE when dereferencing types which cannot be dereferenced #5963
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bors
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Apr 20, 2013
I ran across this when working on some other changes, and it looked like it wasn't too hard to "fix". I'm not very familiar with this code, but it looks like if an error was already generated there's no need to generate and ICE as well when parts of the program can just be ignored for more incorrectness.
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Apr 20, 2013
This closes #4364. I came into rust after modes had begun to be phased out, so I'm not exactly sure what they all did. My strategy was basically to turn on the compilation warnings and then when everything compiles and passes all the tests it's all good. In most cases, I just dropped the mode, but in others I converted things to use `&` pointers when otherwise a move would happen. This depends on #5963. When running the tests, everything passed except for a few compile-fail tests. These tests leaked memory, causing the task to abort differently. By suppressing the ICE from #5963, no leaks happen and the tests all pass. I would have looked into where the leaks were coming from, but I wasn't sure where or how to debug them (I found `RUSTRT_TRACK_ALLOCATIONS`, but it wasn't all that useful).
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Apr 22, 2013
Closes #3083. This takes a similar approach to #5797 where a set is present on the `tcx` of used mutable definitions. Everything is by default warned about, and analyses must explicitly add mutable definitions to this set so they're not warned about. Most of this was pretty straightforward, although there was one caveat that I ran into when implementing it. Apparently when the old modes are used (or maybe `legacy_modes`, I'm not sure) some different code paths are taken to cause spurious warnings to be issued which shouldn't be issued. I'm not really sure how modes even worked, so I was having a lot of trouble tracking this down. I figured that because they're a legacy thing that I'd just de-mode the compiler so that the warnings wouldn't be a problem anymore (or at least for the compiler). Other than that, the entire compiler compiles without warnings of unused mutable variables. To prevent bad warnings, #5965 should be landed (which in turn is waiting on #5963) before landing this. I figured I'd stick it out for review anyway though.
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I ran across this when working on some other changes, and it looked like it wasn't too hard to "fix". I'm not very familiar with this code, but it looks like if an error was already generated there's no need to generate and ICE as well when parts of the program can just be ignored for more incorrectness.