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          Stabilise then
          #79299
        
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    Stabilise then
  
  #79299
              
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  This was referenced Nov 22, 2020 
      
| Thanks! @bors r+ | 
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Stabilise `then` Stabilises the lazy variant of rust-lang#64260 now that the FCP [has ended](rust-lang#64260 (comment)). I've kept the original feature gate `bool_to_option` for the strict variant (`then_some`), and created a new insta-stable feature gate `lazy_bool_to_option` for `then`.
    
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Rollup of 10 pull requests Successful merges: - rust-lang#76941 (Add f{32,64}::is_subnormal) - rust-lang#77697 (Split each iterator adapter and source into individual modules) - rust-lang#78305 (Stabilize alloc::Layout const functions) - rust-lang#78608 (Stabilize refcell_take) - rust-lang#78793 (Clean up `StructuralEq` docs) - rust-lang#79267 (BTreeMap: address namespace conflicts) - rust-lang#79293 (Add test for eval order for a+=b) - rust-lang#79295 (BTreeMap: fix minor testing mistakes in rust-lang#78903) - rust-lang#79297 (BTreeMap: swap the names of NodeRef::new and Root::new_leaf) - rust-lang#79299 (Stabilise `then`) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
| This seems like it should be  | 
    
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rustls uses bool::then, for example, stabilized in 1.50: rust-lang/rust#79299 Note that their real MSRV is 1.52.1 so this may need to be bumped further.
      
        
      
      
  
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Stabilises the lazy variant of #64260 now that the FCP has ended.
I've kept the original feature gate
bool_to_optionfor the strict variant (then_some), and created a new insta-stable feature gatelazy_bool_to_optionforthen.