rust: Add type annotation to fix inference on Rust Nightly
When compiling with Rust Nightly, the im-rs crate silently makes use of the
experimental language feature for trait impl specialization. This apperently
changes public its APIs in subtle ways such that type inference of some user
code can fail where it succeeds when specialization is disabled.
This made Mercurial’s Rust unit tests have compilation errors on Nightly.
I have not managed to find the exactl root cause, but I wrote down my findings
so far at https://github.com/bodil/im-rs/issues/188
This adds type annotation to make unit tests rely less on type inference
and work around the issue.
Differential Revision: https://phab.mercurial-scm.org/D10742
Test that the syntax of "unified tests" is properly processed
==============================================================
Simple commands:
$ echo foo
foo
$ printf 'oh no'
oh no (no-eol)
$ printf 'bar\nbaz\n' | cat
bar
baz
Multi-line command:
$ foo() {
> echo bar
> }
$ foo
bar
Return codes before inline python:
$ sh -c 'exit 1'
[1]
Doctest commands:
>>> from __future__ import print_function
>>> print('foo')
foo
$ echo interleaved
interleaved
>>> for c in 'xyz':
... print(c)
x
y
z
>>> print()
>>> foo = 'global name'
>>> def func():
... print(foo, 'should be visible in func()')
>>> func()
global name should be visible in func()
>>> print('''multiline
... string''')
multiline
string
Regular expressions:
$ echo foobarbaz
foobar.* (re)
$ echo barbazquux
.*quux.* (re)
Globs:
$ printf '* \\foobarbaz {10}\n'
\* \\fo?bar* {10} (glob)
Literal match ending in " (re)":
$ echo 'foo (re)'
foo (re)
Windows: \r\n is handled like \n and can be escaped:
#if windows
$ printf 'crlf\r\ncr\r\tcrlf\r\ncrlf\r\n'
crlf
cr\r (no-eol) (esc)
\tcrlf (esc)
crlf\r (esc)
#endif
Escapes:
$ "$PYTHON" -c 'from mercurial.utils.procutil import stdout; stdout.write(b"\xff")'
\xff (no-eol) (esc)
Escapes with conditions:
$ "$PYTHON" -c 'from mercurial.utils.procutil import stdout; stdout.write(b"\xff")'
\xff (no-eol) (esc) (true !)
Combining esc with other markups - and handling lines ending with \r instead of \n:
$ printf 'foo/bar\r'
fo?/bar\r (no-eol) (glob) (esc)
#if windows
$ printf 'foo\\bar\r'
foo/bar\r (no-eol) (esc)
#endif
$ printf 'foo/bar\rfoo/bar\r'
foo.bar\r [(]no-eol[)] (re) (esc)
foo.bar\r \(no-eol\) (re)
testing hghave
$ hghave true
$ hghave false
skipped: missing feature: nail clipper
[1]
$ hghave no-true
skipped: system supports yak shaving
[1]
$ hghave no-false
Conditional sections based on hghave:
#if true
$ echo tested
tested
#else
$ echo skipped
#endif
#if false
$ echo skipped
#else
$ echo tested
tested
#endif
#if no-false
$ echo tested
tested
#else
$ echo skipped
#endif
#if no-true
$ echo skipped
#else
$ echo tested
tested
#endif
Exit code:
$ (exit 1)
[1]