Improve checking LHS of Assign #22977
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Could rebase on main? There seems to be some conflicts. |
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I think it's time for that coffee. Edit: by which I mean, I still have reservations about this simple solution, but I will follow up with an over-engineered solution at a future date. |
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Fixes scala#22970 Simple example showing how awkward this is compared to a traversal, where there is more control when descending. Previously, it "ignored" the LHS of Assign to avoid taking `x = y` as ref to `x` instead of assignment to. Now, "mark" the LHS as assignment, so `transformIdent` and `Select` set a "mode" flag, such that `x` is correctly taken as either a ref or assign to `x`. Probably there is more complex syntax to handle as LHS, but I haven't had coffee yet. [Cherry-picked 9bee756]
odersky
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Fixes scala#22970 Simple example showing how awkward this is compared to a traversal, where there is more control when descending. Previously, it "ignored" the LHS of Assign to avoid taking `x = y` as ref to `x` instead of assignment to. Now, "mark" the LHS as assignment, so `transformIdent` and `Select` set a "mode" flag, such that `x` is correctly taken as either a ref or assign to `x`. Probably there is more complex syntax to handle as LHS, but I haven't had coffee yet.
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Fixes #22970
Simple example showing how awkward this is compared to a traversal, where there is more control when descending.
Previously, it "ignored" the LHS of Assign to avoid taking
x = yas ref toxinstead of assignment to.Now, "mark" the LHS as assignment, so
transformIdentandSelectset a "mode" flag, such thatxis correctly taken as either a ref or assign tox.Probably there is more complex syntax to handle as LHS, but I haven't had coffee yet.