Allow Float::ldexp to be called as a method

[milibopp]

Fixes#22098.

[rust-highfive]

r? @aturon

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[frewsxcv]

Needs a rebase

[bors]

☔ The latest upstream changes (presumably #22984) made this pull request unmergeable. Please resolve the merge conflicts.

[aturon]

@aepsil0n Sorry this PR totally fell through the cracks in my inbox! (Feel free to ping me or others on IRC if you're not hearing anything).

Anyway, this looks good to me after a rebase.

[milibopp]

I wasn't around for the last days. Will rebase later.

[milibopp]

@aturon rebase is done.

[aturon]

Thanks!

@bors: r+ 316f7e8 rollup

[Manishearth]

This fails some tests on Linux, looks like you duplicated the unit tests:

/opt/rust/src/libstd/num/f32.rs:2369:5: 2378:6 error: duplicate definition of value `test_abs`
/opt/rust/src/libstd/num/f32.rs:2381:5: 2390:6 error: duplicate definition of value `test_abs_sub`
/opt/rust/src/libstd/num/f32.rs:2393:5: 2396:6 error: duplicate definition of value `test_abs_sub_nowin`
/opt/rust/src/libstd/num/f32.rs:2399:5: 2408:6 error: duplicate definition of value `test_signum`
/opt/rust/src/libstd/num/f32.rs:2411:5: 2420:6 error: duplicate definition of value `test_is_positive`
/opt/rust/src/libstd/num/f32.rs:2423:5: 2432:6 error: duplicate definition of value `test_is_negative`
/opt/rust/src/libstd/num/f32.rs:2435:5: 2449:6 error: duplicate definition of value `test_is_normal`
/opt/rust/src/libstd/num/f32.rs:2452:5: 2466:6 error: duplicate definition of value `test_classify`
/opt/rust/src/libstd/num/f32.rs:2469:5: 2486:6 error: duplicate definition of value `test_ldexp`
/opt/rust/src/libstd/num/f32.rs:2489:5: 2503:6 error: duplicate definition of value `test_frexp`
/opt/rust/src/libstd/num/f32.rs:2506:5: 2513:6 error: duplicate definition of value `test_frexp_nowin`
/opt/rust/src/libstd/num/f32.rs:2516:5: 2525:6 error: duplicate definition of value `test_integer_decode`
/opt/rust/src/libstd/num/f32.rs:2528:5: 2536:6 error: duplicate definition of value `test_sqrt_domain`

[removed from rollup]

[milibopp]

oops… I wasn't careful enough doing the rebase.

[bors]

⌛ Testing commit 316f7e8 with merge 32bed7a...

[milibopp]

fixed.

[Manishearth]

@bors: r=aturon

[bors]

📌 Commit 5bfb5ba has been approved by aturon