salsa 0.28.2

A generic framework for on-demand, incrementalized computation (experimental)
Documentation 
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error: `singleton` option not allowed here
  --> tests/compile-fail/singleton_only_for_input.rs:11:18
   |
11 | #[salsa::tracked(singleton)]
   |                  ^^^^^^^^^

error: `singleton` option not allowed here
  --> tests/compile-fail/singleton_only_for_input.rs:16:19
   |
16 | #[salsa::interned(singleton)]
   |                   ^^^^^^^^^

error: `singleton` option not allowed here
  --> tests/compile-fail/singleton_only_for_input.rs:21:18
   |
21 | #[salsa::tracked(singleton)]
   |                  ^^^^^^^^^

error: `singleton` option not allowed here
  --> tests/compile-fail/singleton_only_for_input.rs:26:22
   |
26 | #[salsa::accumulator(singleton)]
   |                      ^^^^^^^^^