effectful 0.2.1

Effect<A, E, R> (sync + async), context/layers, pipe — interpreter-style, no bundled executor
Documentation 
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#[test]
fn span_macro_compile_failures() {
  let cases = trybuild::TestCases::new();
  cases.compile_fail("tests/ui/span_non_debug_arg.rs");
  cases.compile_fail("tests/ui/span_non_effect_return.rs");
  cases.pass("tests/ui/span_non_debug_skipped.rs");
}