Failure to build Rust 1.91.1

Hi guys, just to introduce quickly, I am working from a couple of years on a new package manager for Linux.

Yesterday I tried to build rust 1.91.1 from the source, but I am getting this error:

mpiling unic-langid-macros v0.9.6
error[E0119]: conflicting implementations of trait `IntoSliceIdx<_, [_]>` for type `RangeToInclusive<_>`
   --> compiler/rustc_index/src/idx.rs:145:1
    |
103 | impl<I: Idx, T> IntoSliceIdx<I, [T]> for ops::RangeToInclusive<I> {
    | ----------------------------------------------------------------- first implementation here
...
145 | impl<I: Idx, T> IntoSliceIdx<I, [T]> for core::range::RangeToInclusive<I> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `RangeToInclusive<_>`

   Compiling unic-langid v0.9.6
error[E0560]: struct `std::range::RangeInclusive<usize>` has no field named `last`
   --> compiler/rustc_index/src/idx.rs:140:66
    |
140 |         core::range::RangeInclusive { start: self.start.index(), last: self.last.index() }
    |                                                                  ^^^^ `std::range::RangeInclusive<_>` does not have this field
    |
    = note: available fields are: `end`

error[E0609]: no field `last` on type `std::range::RangeInclusive<I>`
   --> compiler/rustc_index/src/idx.rs:140:77
    |
140 |         core::range::RangeInclusive { start: self.start.index(), last: self.last.index() }
    |                                                                             ^^^^ unknown field
    |
    = note: available fields are: `start`, `end`

error[E0560]: struct `RangeToInclusive<_>` has no field named `last`
   --> compiler/rustc_index/src/idx.rs:149:41
    |
149 |         core::range::RangeToInclusive { last: self.last.index() }
    |                                         ^^^^ `RangeToInclusive<_>` does not have this field
    |
    = note: available fields are: `end`

error[E0609]: no field `last` on type `RangeToInclusive<I>`
   --> compiler/rustc_index/src/idx.rs:149:52
    |
149 |         core::range::RangeToInclusive { last: self.last.index() }
    |                                                    ^^^^ unknown field
    |
    = note: available field is: `end`

   Compiling intl-memoizer v0.5.3
Some errors have detailed explanations: E0119, E0560, E0609.
For more information about an error, try `rustc --explain E0119`.
error: could not compile `rustc_index` (lib) due to 5 previous errors
warning: build failed, waiting for other jobs to finish...
Build completed unsuccessfully in 0:31:07

Full log: https://textup.fr/886374RO

This is the config.toml I used:

change-id = ignore

[llvm]
targets = "X86"
link-shared = true

[build]
build = "x86_64-unknown-linux-gnu"
target = ["x86_64-unknown-linux-gnu"]
docs = false
extended = true
locked-deps = true
tools = ["cargo", "rustdoc"]
vendor = true
local-rebuild=true

[install]
prefix = "/usr"
docdir = "share/doc/rustc-1.91.1"

[rust]
channel = "stable"
lto = "thin"
codegen-units = 1

[target.x86_64-unknown-linux-gnu]
crt-static = false

The commands I used to build rust are:

LIBSSH2_SYS_USE_PKG_CONFIG=1 LIBSQLITE3_SYS_USE_PKG_CONFIG=1 ./x.py build library/std --stage 0
LIBSSH2_SYS_USE_PKG_CONFIG=1 LIBSQLITE3_SYS_USE_PKG_CONFIG=1 ./x.py install rustc std cargo

Start by reproducing the failure with the posted config.toml and x.py commands, then inspect compiler/rustc_index/src/idx.rs around the reported lines. Compare the build's Rust sources and toolchain assumptions against the range-type errors. Done means identifying the compatibility problem and confirming a successful build or documenting the required configuration or version.