Move `emit_stashed_diagnostic` call in rustfmt.

This call was added to `parse_crate_mod` in #121487, to fix a case where
a stashed diagnostic wasn't emitted. But there is another path where a
stashed diagnostic might fail to be emitted if there's a parse error, if
the `build` call in `parse_crate_inner` fails before `parse_crate_mod`
is reached.

So this commit moves the `emit_stashed_diagnostic` call outwards, from
`parse_crate_mod` to `format_project`, just after the
`Parser::parse_crate` call. This should be far out enough to catch any
parsing errors.

Fixes #121517.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/tools/rustfmt/tests/parser/stashed-diag2.rs b/src/tools/rustfmt/tests/parser/stashed-diag2.rs
new file mode 100644
index 00000000000..579a69def16
--- /dev/null
+++ b/src/tools/rustfmt/tests/parser/stashed-diag2.rs
@@ -0,0 +1,3 @@
+trait Trait<'1> { s> {}
+
+fn main() {}