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fix: segfault in positional arg completion
Adding the inputPath as a positional feature uncovered this bug. As positional argument forms were discarded from the `expectedArgs` list, their closures were not. When the `.completer` closure was then called, part of the surrounding object did not exist anymore. This didn't cause an issue before, but with the new call to `getEvalState()` in the "inputs" completer in nix/flake.cc, a segfault was triggered reproducibly on invalid memory access to the `this` pointer, which was always 0. The solution of splicing the argument forms into a new list to extend their lifetime is a bit of a hack, but I was unable to get the "nicer" iterator-based solution to work.
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