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refactor: In alter_ty_path, return on failed unpack #1820

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refactor: In alter_ty_path, return on failed unpack #1820

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35 changes: 32 additions & 3 deletions c2rust-refactor/src/macros.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,14 @@ macro_rules! match_or_else {
([$e:expr] $($arm_pat:pat => $arm_body:expr),*; $or_else:expr) => {
match $e {
$( $arm_pat => $arm_body, )*
ref x @ _ => $or_else(x),
_ => $or_else,
}
};

([$e:expr] $($arm_pat:pat => $arm_body:expr),*; $or_else_var:ident => $or_else:expr) => {
match $e {
$( $arm_pat => $arm_body, )*
ref $or_else_var @ _ => $or_else,
}
};
}
Expand All @@ -22,11 +29,11 @@ macro_rules! match_or_else {
macro_rules! expect {
([$e:expr] $arm_pat:pat => $arm_body:expr) => {
$crate::match_or_else!([$e] $arm_pat => $arm_body;
|x| panic!("expected {}, got {:?}", stringify!($arm_pat), x))
x => panic!("expected {}, got {:?}", stringify!($arm_pat), x))
};
([$e:expr] $($arm_pat:pat => $arm_body:expr),*) => {
$crate::match_or_else!([$e] $($arm_pat => $arm_body),*;
|x| panic!("expected one of: {}, got {:?}", stringify!($($arm_pat),*), x))
x => panic!("expected one of: {}, got {:?}", stringify!($($arm_pat),*), x))
};
}

Expand All @@ -35,6 +42,28 @@ macro_rules! unpack {
([$e:expr] $enum_:ident :: $variant:ident ( $($arg:ident),* )) => {
let ($($arg,)*) = $crate::expect!([$e] $enum_::$variant($($arg),*) => ($($arg,)*));
};

(
[$e:expr]
$enum_:ident :: $variant:ident ( $($arg:ident),* );
$or_else:expr
) => {
let ($($arg,)*) = $crate::match_or_else!(
[$e] $enum_::$variant($($arg),*) => ($($arg,)*);
$or_else
);
};

(
[$e:expr]
$enum_:ident :: $variant:ident ( $($arg:ident),* );
$or_else_var:ident => $or_else:expr
) => {
let ($($arg,)*) = $crate::match_or_else!(
[$e] $enum_::$variant($($arg),*) => ($($arg,)*);
$or_else_var => $or_else
);
};
}

#[macro_export]
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2 changes: 1 addition & 1 deletion c2rust-refactor/src/path_edit.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -124,7 +124,7 @@ where
_ => {}
}

unpack!([&mut t.kind] TyKind::Path(qself, path));
unpack!([&mut t.kind] TyKind::Path(qself, path); return);
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@ahomescu ahomescu May 22, 2026

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Silencing errors isn't really the way to fix issues, let's investigate this.

Any idea why a type would appear as hir::TyKind::Path in the HIR, but as an Rptr in the AST? Maybe an alias? Could you print out which type this is?

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@Rua Rua May 23, 2026 •
edited
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I printed out qpath when t.kind isn't TyKind::Path:

if !matches!(t.kind, TyKind::Path(..)) {
    panic!("{qpath:?}");
}

and got:

Resolved(
    None,
    Path {
        span: Span {
            lo: BytePos(129233),
            hi: BytePos(129242),
            ctxt: #57
        },
        res: PrimTy(
            Bool
        ),
        segments: [
            PathSegment {
                ident: bool#57,
                hir_id: HirId {
                    owner: OwnerId {
                        def_id: DefId {
                            krate: crate0,
                            index: DefIndex(
                                50254
                            )
                        }
                    },
                    local_id: 25
                },
                res: PrimTy(
                    Bool
                ),
                args: None,
                infer_args: false
            }
        ]
    }
)

So it's... bool? Not sure how to make sense of that one.

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@Rua Rua May 23, 2026

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Random thought: if the refactorer is making modifications to the AST, what happens to the HIR? Is it modified in parallel? If not, what keeps the two in sync? Could that be the issue here?

let (new_qself, new_path) =
self.handle_qpath(id, qself.clone(), path.clone(), qpath);
*qself = new_qself;
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