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          std: Stabilize into_* ASCII methods
          #32020
        
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    | Nominating for beta backport as it's something we intended to do anyway. | 
| r? @brson | 
These were intended to land in stable 1.8 but were just waiting for the implementation PR, so now they're landing. Specifically this PR stabilizes: * `AsciiExt::into_ascii_uppercase` * `AsciiExt::into_ascii_lowercase` * `AsciiExt for Vec<u8>` * `AsciiExt for String`
| @bors r+ | 
| 📌 Commit 48fd993 has been approved by  | 
    
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…r=brson These were intended to land in stable 1.8 but were just waiting for the implementation PR, so now they're landing. Specifically this PR stabilizes: * `AsciiExt::into_ascii_uppercase` * `AsciiExt::into_ascii_lowercase` * `AsciiExt for Vec<u8>` * `AsciiExt for String`
| ⌛ Testing commit 48fd993 with merge 2a8243e... | 
| 💔 Test failed - auto-linux-64-opt | 
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These were intended to land in stable 1.8 but were just waiting for the implementation PR, so now they're landing. Specifically this PR stabilizes: * `AsciiExt::into_ascii_uppercase` * `AsciiExt::into_ascii_lowercase` * `AsciiExt for Vec<u8>` * `AsciiExt for String`
| Removing beta-nominated tag as we're going to revert this. | 
    
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The addition of these methods in rust-lang#31335 required adding impls of the trait for the `String` and `Vec<T>` types. This unfortunately caused a regression (rust-lang#32074) in type inference for using these methods which the libs team has decided to not push forward with. These methods were stabilized in rust-lang#32020 which was intended to get backported to beta, but the backport hasn't happened just yet. This commit reverts both the addition and stabilization of these methods. One proposed method of handling this, in rust-lang#32076, was to move the methods to an extra trait to avoid conflicts with type inference. After some discussion, however, the libs team concluded that we probably want to reevaluate what we're doing here, so discussion will continue on the tracking issue, rust-lang#27809.
    
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std: Revert addition of `into_ascii_*` methods The addition of these methods in #31335 required adding impls of the trait for the `String` and `Vec<T>` types. This unfortunately caused a regression (#32074) in type inference for using these methods which the libs team has decided to not push forward with. These methods were stabilized in #32020 which was intended to get backported to beta, but the backport hasn't happened just yet. This commit reverts both the addition and stabilization of these methods. One proposed method of handling this, in #32076, was to move the methods to an extra trait to avoid conflicts with type inference. After some discussion, however, the libs team concluded that we probably want to reevaluate what we're doing here, so discussion will continue on the tracking issue, #27809. Closes #32074
    
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The addition of these methods in rust-lang#31335 required adding impls of the trait for the `String` and `Vec<T>` types. This unfortunately caused a regression (rust-lang#32074) in type inference for using these methods which the libs team has decided to not push forward with. These methods were stabilized in rust-lang#32020 which was intended to get backported to beta, but the backport hasn't happened just yet. This commit reverts both the addition and stabilization of these methods. One proposed method of handling this, in rust-lang#32076, was to move the methods to an extra trait to avoid conflicts with type inference. After some discussion, however, the libs team concluded that we probably want to reevaluate what we're doing here, so discussion will continue on the tracking issue, rust-lang#27809. Conflicts: src/libstd/ascii.rs
  
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These were intended to land in stable 1.8 but were just waiting for the
implementation PR, so now they're landing. Specifically this PR stabilizes:
AsciiExt::into_ascii_uppercaseAsciiExt::into_ascii_lowercaseAsciiExt for Vec<u8>AsciiExt for String