Rollup of 11 pull requests

[Centril]

Successful merges:

• Test that maplike FromIter satisfies uniqueness #62709 (Test that maplike FromIter satisfies uniqueness)
• do not use assume_init in std::io #62746 ( do not use assume_init in std::io)
• Suggest trait bound on type parameter when it is unconstrained #62772 (Suggest trait bound on type parameter when it is unconstrained)
• Fix typo in src/libstd/net/udp.rs doc comment #62787 (Fix typo in src/libstd/net/udp.rs doc comment)
• normalize use of backticks in compiler messages for libcore/ptr #62788 (normalize use of backticks in compiler messages for libcore/ptr)
• Handle more cases of typos misinterpreted as type ascription #62791 (Handle more cases of typos misinterpreted as type ascription)
• rustc_typeck: improve diagnostics for _ const/static declarations #62804 (rustc_typeck: improve diagnostics for _ const/static declarations)
• Revert "Disable stack probing for gnux32." #62808 (Revert "Disable stack probing for gnux32.")
• normalize use of backticks in compiler messages for librustc_metadata #62812 (normalize use of backticks in compiler messages for librustc_metadata)
• rustc: Compile the fmt_macros crate as an rlib #62813 (rustc: Compile the fmt_macros crate as an rlib)
• normalize use of backticks in compiler messages for librustc_incremental #62832 (normalize use of backticks in compiler messages for librustc_incremental)

Failed merges:

r? @ghost

[Centril]

@bors r+ p=11 rollup=never

[bors]

📌 Commit 6558b98 has been approved by Centril

[bors]

⌛ Testing commit 6558b98 with merge fd584a066edde978d593300b0918dfa700e9c531...

[bors]

💔 Test failed - checks-azure

[rust-highfive]

Your PR failed (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

2019-07-21T07:05:33.5721986Z do so (now or later) by using -b with the checkout command again. Example:
2019-07-21T07:05:33.5722040Z 
2019-07-21T07:05:33.5722323Z   git checkout -b <new-branch-name>
2019-07-21T07:05:33.5722370Z 
2019-07-21T07:05:33.5722683Z HEAD is now at fd584a066 Auto merge of #62840 - Centril:rollup-5ettkjy, r=Centril
2019-07-21T07:05:33.5875289Z ##[section]Starting: Collect CPU-usage statistics in the background
2019-07-21T07:05:33.5879069Z ==============================================================================
2019-07-21T07:05:33.5879164Z Task         : Bash
2019-07-21T07:05:33.5879248Z Description  : Run a Bash script on macOS, Linux, or Windows
---
2019-07-21T07:08:55.3050814Z Script contents:
2019-07-21T07:08:55.3051445Z aws s3 cp --acl public-read cpu-usage.csv s3://$DEPLOY_BUCKET/rustc-builds/$BUILD_SOURCEVERSION/cpu-$SYSTEM_JOBNAME.csv
2019-07-21T07:08:55.3071268Z ========================== Starting Command Output ===========================
2019-07-21T07:08:55.3092118Z [command]/bin/bash --noprofile --norc /home/vsts/work/_temp/fc63736e-cfb2-44ae-a9f2-7c0cd287aa91.sh
2019-07-21T07:08:55.3186915Z /home/vsts/work/_temp/fc63736e-cfb2-44ae-a9f2-7c0cd287aa91.sh: line 1: aws: command not found
2019-07-21T07:08:55.3222103Z ##[error]Bash exited with code '127'.
2019-07-21T07:08:55.3255938Z ##[section]Starting: Checkout
2019-07-21T07:08:55.3257759Z ==============================================================================
2019-07-21T07:08:55.3257847Z Task         : Get sources
2019-07-21T07:08:55.3257948Z Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.

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