Compiler gives the following warning:
`warning: the `u` suffix on integers is deprecated; use `us` or one of the fixed-sized suffixes`
And also the errror:
`error: mismatched types: expected `u64`, found `usize` (expected u64, found usize)`
Changing the suffix to `u64` results in a successful `cargo run` outputting the desired `Versions compared successfully!`
Part of #18085
Instead of using an Enum, we use a struct with Option<&Tree> as leaves. It allow
to limit a lot of allocation.
before:
```
texitoi@vaio:~/dev/benchmarksgame-rs$ time ./bin/binary-trees-orig 20
stretch tree of depth 21 check: -1
2097152 trees of depth 4 check: -2097152
524288 trees of depth 6 check: -524288
131072 trees of depth 8 check: -131072
32768 trees of depth 10 check: -32768
8192 trees of depth 12 check: -8192
2048 trees of depth 14 check: -2048
512 trees of depth 16 check: -512
128 trees of depth 18 check: -128
32 trees of depth 20 check: -32
long lived tree of depth 20 check: -1
real 0m3.860s
user 0m11.032s
sys 0m3.572s
```
after:
```
texitoi@vaio:~/dev/benchmarksgame-rs$ time ./bin/binary-trees 20
stretch tree of depth 21 check: -1
2097152 trees of depth 4 check: -2097152
524288 trees of depth 6 check: -524288
131072 trees of depth 8 check: -131072
32768 trees of depth 10 check: -32768
8192 trees of depth 12 check: -8192
2048 trees of depth 14 check: -2048
512 trees of depth 16 check: -512
128 trees of depth 18 check: -128
32 trees of depth 20 check: -32
long lived tree of depth 20 check: -1
real 0m2.824s
user 0m9.224s
sys 0m1.428s
```
There is likely to be new users with the alpha release, and there are a lot of documents on the internet (StackOverflow, reddit, blogs) that refer to these guides, so emitting a more helpful error than "404" is nice. Hence, I've temporarily reinstated stub documents for each of the old guides, referring to as relevant a part of the book as possible.
Also, rustbook was silently ignoring some errors, which lead to an inconsistency with directory creation/file writing. This meant the CSS file was not being written if no `doc` directory existed in the users build dir (e.g. the buildbots). This should mean that the CSS will appear automatically in later builds.
Here's my PR for the changes discussed in #19823. I decided to leave `_these_` types of italics the way there were because it differentiates the use of italics for emphasis from `*key term*` italics. Otherwise, bolded terms have been changed to italics, and single and double quotes have been changed appropriately, depending on their context (my judgement may not be the best, though).
r? @steveklabnik (congratulations on #19897 being finalized and merged, by the way!)
This will temporarily prevent warnings generated from expanding to code that the
test harness itself uses. This solution will require tweaking around the beta
cycle, but it will prevent spurious warnings for now.
Closes#20823
This will temporarily prevent warnings generated from expanding to code that the
test harness itself uses. This solution will require tweaking around the beta
cycle, but it will prevent spurious warnings for now.
Closes#20823
Currently we pass a `struct S(u64)` as an immediate value on i686, but a
`struct S { x: u64 }` is passed indirectly. This seems pretty wrong,
as they both have the same underlying LLVM type `{ i64 }`, no sense in
treating them differently.
