partial-borrow 1.0.1

#!/usr/bin/perl -w
#
# Copyright 2021 Ian Jackson and contributors
# SPDX-License-Identifier: GPL-3.0-or-later
# There is NO WARRANTY.

# After running this,
#  TRYBUILD=overwrite nailing-cargo -E test --lib -- --nocapture reject
# can help

use strict;
use POSIX;

sub perm ($) {
  my ($i) = @_;
  $i eq 'no' ? '!' : $i;
}
sub type ($) {
  my ($i) = @_;
  $i eq 'whole' ? 'X' : sprintf "partial!(X %s a)", perm($i);
}

sub make_one ($$$) {
  my ($f,$e,$d) = @_;
  open F, "> reject/$f.new" or die $!;
  print F $d or die $!;
  close F or die $!;
  rename "reject/$f.new", "reject/$f.rs" or die $!;
  if (stat "reject/$f.stderr") {
  } elsif ($! != &ENOENT) {
    die $!;
  } else {
    open E, ">> reject/$f.stderr" or die $!;
    print E $e or die $!;
    close E or die $!;
  }
}

sub bad_dg {
  my ($i, $o) = @_;
  bad_dgi($i,$o);
  bad_dgi('whole',$o) if $i eq 'mut';
}
sub bad_dgi ($$) {
  my ($i, $o) = @_;
  my $it = type($i);
  my $ot = type($o);
  make_one("autobad-dg-$i-$o", <<END, <<END);
error[E0277]: the trait bound `\u$o: IsDowngradeFrom<\u$i>` is not satisfied
END
// !!!!! Note - autogenerated file! - edit reject/make-rejects instead !!!!!
//
// Copyright 2021 Ian Jackson and contributors
// SPDX-License-Identifier: GPL-3.0-or-later
// There is NO WARRANTY.

use partial_borrow::prelude::*;

#[derive(PartialBorrow,Default)]
struct X { a: usize }

fn main(){
  let mut x = X::default();
  let d: &mut $it = x.as_mut();
  let e: &mut $ot = d.as_mut();
}
END
}

sub bad_split {
  my ($i,$d,$e) = @_;
  bad_spliti($i,$d,$e);
  bad_spliti('whole',$d,$e) if $i eq 'mut';
}
sub bad_spliti ($$$) {
  my ($i,$d,$e) = @_;
  my $it = type($i);
  my $dt = type($d);
  my $et = type($e);
  make_one("autobad-split-$i-$d-$e", <<END, <<END);
error[E0277]: the trait bound `\u$i: CanSplitInto<\u$d, \u$e>` is not satisfied
END
// !!!!! Note - autogenerated file! - edit reject/make-rejects instead !!!!!
//
// Copyright 2021 Ian Jackson and contributors
// SPDX-License-Identifier: GPL-3.0-or-later
// There is NO WARRANTY.

use partial_borrow::prelude::*;

#[derive(PartialBorrow,Default)]
struct X { a: usize }

fn main(){
  let mut x = X::default();
  let i: &mut $it = x.as_mut();
  let (d,e): (&mut $dt,
              &mut $et) = i.into();
}
END
}

sub bad_deref {
  my ($i,$o) = @_;
  my $it = type($i);
  my $omut = $o eq 'mut' ? 'mut' : '';

  make_one("autobad-deref-field-$i-$o", $i eq 'no' ? <<END : <<END, <<END);
error[E0614]: type `F_a<\u$i, usize, X>` cannot be dereferenced
END
error[E0596]: cannot borrow data in a dereference of `F_a<\u$i, usize, X>` as mutable
END
// !!!!! Note - autogenerated file! - edit reject/make-rejects instead !!!!!
//
// Copyright 2021 Ian Jackson and contributors
// SPDX-License-Identifier: GPL-3.0-or-later
// There is NO WARRANTY.

use partial_borrow::prelude::*;

#[derive(PartialBorrow,Default)]
struct X { a: usize }

fn main(){
  let mut x = X::default();
  let d: &mut $it = x.as_mut();
  let _f: &$omut usize = &$omut *d.a;
}
END

  make_one("autobad-deref-whole-$i-$o", $i eq 'no' ? <<END : <<END, <<END);
error[E0614]: type `X__Partial<\u$i>` cannot be dereferenced
END
error[E0596]: cannot borrow data in a dereference of `X__Partial<\u$i>` as mutable
END
// !!!!! Note - autogenerated file! - edit reject/make-rejects instead !!!!!
//
// Copyright 2021 Ian Jackson and contributors
// SPDX-License-Identifier: GPL-3.0-or-later
// There is NO WARRANTY.

use partial_borrow::prelude::*;

#[derive(PartialBorrow,Default)]
struct X { a: usize }

fn main(){
  let mut x = X::default();
  let d: &mut $it = x.as_mut();
  let _o: &$omut X = &$omut **d;
}
END
}

bad_dg(qw( const mut   ));
bad_dg(qw( no    mut   ));
bad_dg(qw( no    const ));

bad_deref(qw( const mut   ));
bad_deref(qw( no    mut   ));
bad_deref(qw( no    const ));

bad_split(qw( mut   mut   mut   ));
bad_split(qw( mut   mut   const ));
bad_split(qw( const mut   mut   ));
bad_split(qw( const mut   const ));
bad_split(qw( const mut   no    ));
bad_split(qw( no    mut   mut   ));
bad_split(qw( no    mut   const ));
bad_split(qw( no    mut   no    ));
bad_split(qw( no    const const ));
bad_split(qw( no    const no    ));