Remove the unstable Float trait

[SimonSapin]

Following up to #49896 and #50629. Fixes#32110.

[rust-highfive]

r? @withoutboats

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[rust-highfive]

The job x86_64-gnu-llvm-3.9 of your PR failed on Travis (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.

[01:27:55] [01:27:55] failures:
[01:27:55] [01:27:55] ---- /checkout/obj/build/x86_64-unknown-linux-gnu/test/error-index.md - Rust_Compiler_Error_Index::E0689 (line 10992) stdout ----
[01:27:55] error[E0599]: no method named `recip` found for type `{float}` in the current scope
[01:27:55] --> /checkout/obj/build/x86_64-unknown-linux-gnu/test/error-index.md:10993:5
[01:27:55] |
[01:27:55] 3 | 2.0.recip();
[01:27:55] [01:27:55] [01:27:55] thread '/checkout/obj/build/x86_64-unknown-linux-gnu/test/error-index.md - Rust_Compiler_Error_Index::E0689 (line 10992)' panicked at 'Some expected error codes were not found: ["E0689"]', librustdoc/test.rs:330:13
[01:27:55] [01:27:55] ---- /checkout/obj/build/x86_64-unknown-linux-gnu/test/error-index.md - Rust_Compiler_Error_Index::E0689 (line 10998) stdout ----
[01:27:55] ---- /checkout/obj/build/x86_64-unknown-linux-gnu/test/error-index.md - Rust_Compiler_Error_Index::E0689 (line 10998) stdout ----
[01:27:55] error[E0599]: no method named `recip` found for type `{float}` in the current scope
[01:27:55] --> /checkout/obj/build/x86_64-unknown-linux-gnu/test/error-index.md:11000:3
[01:27:55] |
[01:27:55] 4 | x.recip(); // same error as above
[01:27:55] | ^^^^^
[01:27:55] [01:27:55] thread '/checkout/obj/build/x86_64-unknown-linux-gnu/test/error-index.md - Rust_Compiler_Error_Index::E0689 (line 10998)' panicked at 'Some expected error codes were not found: ["E0689"]', librustdoc/test.rs:330:13
[01:27:55] [01:27:55] failures:
[01:27:55] /checkout/obj/build/x86_64-unknown-linux-gnu/test/error-index.md - Rust_Compiler_Error_Index::E0689 (line 10992)
[01:27:55] /checkout/obj/build/x86_64-unknown-linux-gnu/test/error-index.md - Rust_Compiler_Error_Index::E0689 (line 10998)
---
[01:27:55] [01:27:55] [01:27:55] failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test
[01:27:55] Build completed unsuccessfully in 0:42:25
[01:27:55] Makefile:58: recipe for target 'check' failed
[01:27:55] make: *** [check] Error 1
The command "stamp sh -x -c "$RUN_SCRIPT"" exited with 2.
travis_time:start:12ceaada
$ date && (curl -fs --head https://google.com | grep ^Date: | sed 's/Date: //g' || true)

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

[rust-highfive]

The job x86_64-gnu-llvm-3.9 of your PR failed on Travis (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.

[01:53:37] [01:53:37] failures:
[01:53:37] [01:53:37] ---- /checkout/obj/build/x86_64-unknown-linux-gnu/test/error-index.md - Rust_Compiler_Error_Index::E0689 (line 10992) stdout ----
[01:53:37] thread '/checkout/obj/build/x86_64-unknown-linux-gnu/test/error-index.md - Rust_Compiler_Error_Index::E0689 (line 10992)' panicked at 'test compiled while it wasn't supposed to', librustdoc/test.rs:315:17
[01:53:37] [01:53:37] ---- /checkout/obj/build/x86_64-unknown-linux-gnu/test/error-index.md - Rust_Compiler_Error_Index::E0689 (line 10998) stdout ----
[01:53:37] ---- /checkout/obj/build/x86_64-unknown-linux-gnu/test/error-index.md - Rust_Compiler_Error_Index::E0689 (line 10998) stdout ----
[01:53:37] thread '/checkout/obj/build/x86_64-unknown-linux-gnu/test/error-index.md - Rust_Compiler_Error_Index::E0689 (line 10998)' panicked at 'test compiled while it wasn't supposed to', librustdoc/test.rs:315:17
[01:53:37] [01:53:37] failures:
[01:53:37] /checkout/obj/build/x86_64-unknown-linux-gnu/test/error-index.md - Rust_Compiler_Error_Index::E0689 (line 10992)
[01:53:37] /checkout/obj/build/x86_64-unknown-linux-gnu/test/error-index.md - Rust_Compiler_Error_Index::E0689 (line 10998)
---
[01:53:37] [01:53:37] [01:53:37] failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test
[01:53:37] Build completed unsuccessfully in 0:56:07
[01:53:37] make: *** [check] Error 1
[01:53:37] Makefile:58: recipe for target 'check' failed
The command "stamp sh -x -c "$RUN_SCRIPT"" exited with 2.
travis_time:start:06a72080
$ date && (curl -fs --head https://google.com | grep ^Date: | sed 's/Date: //g' || true)

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

[fbstj]

since Float is being removed, might be worth updating this doc to be more descriptive

[SimonSapin]

Good point, fixed.

[fbstj]

same as before "inherits from Float" is no longer true

[SimonSapin]

I’ve now removed this sentence.

[withoutboats]

I have no context

@bors r? @alexcrichton

[alexcrichton]

@bors: r+

[bors]

📌 Commit b825477 has been approved by alexcrichton

[bors]

⌛ Testing commit b825477 with merge 1977849...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: alexcrichton
Pushing 1977849 to master...