Repository: rust
Issue: Long type name emitted if the type name is part of a suggestion
Labels: A-diagnostics,T-compiler

### Code

```Rust
use diesel::prelude::*; //diesel = { version = "2.2.6", default-features = false, features = ["postgres"] }

diesel::table! {
    foo (id) {
        id -> Int4,
        name -> Text,
    }
}

fn main() {
    diesel::debug_query(
        &foo::table
            .filter(foo::id.eq(42))
            .order(foo::name.desc())
            .limit(10)
            .offset(42),
    );
}
```

### Current output

```Shell
error[E0282]: type annotations needed
  --> src/main.rs:11:5
   |
11 |     diesel::debug_query(
   |     ^^^^^^^^^^^^^^^^^^^ cannot infer type of the type parameter `DB` declared on the function `debug_query`
   |
help: consider specifying the generic arguments
   |
11 |     diesel::debug_query::<DB, SelectStatement<FromClause<table>, query_builder::select_clause::DefaultSelectClause<FromClause<table>>, query_builder::distinct_clause::NoDistinctClause, query_builder::where_clause::WhereClause<diesel::expression::grouped::Grouped<diesel::expression::operators::Eq<columns::id, diesel::expression::bound::Bound<Integer, i32>>>>, query_builder::order_clause::OrderClause<diesel::expression::operators::Desc<columns::name>>, LimitOffsetClause<LimitClause<diesel::expression::bound::Bound<BigInt, i64>>, OffsetClause<diesel::expression::bound::Bound<BigInt, i64>>>>>(
   |                        ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
```

### Desired output

```Shell
error[E0282]: type annotations needed
  --> src/main.rs:11:5
   |
11 |     diesel::debug_query(
   |     ^^^^^^^^^^^^^^^^^^^ cannot infer type of the type parameter `DB` declared on the function `debug_query`
   |
help: consider specifying the generic arguments
   |
11 |     diesel::debug_query::<DB, _>(
   |                           ++ 
```

### Rationale and extra context

Emitting the query type there is not helpful for the users as it is long, makes the error message harder to read and ultimately is not even required to fix the code snippet. Fixing the code snippet only requires to specify the `DB` generic type there. Ideally rustc would be able to suggest possible types for `DB` there, given the existing constraint on `debug_query`. In the example above that's even only satisfied by one type (`diesel::pg::Pg`).

### Other cases

If you change the exact query that you pass to `debug_query` the output changes. You can make the query more complex and therefore get a much more complex and longer query type in the compiler output.

### Rust Version

```Shell
rustc 1.86.0-nightly (649b995a9 2025-01-22)
binary: rustc
commit-hash: 649b995a9febd658b2570160703dff6fdc038ab2
commit-date: 2025-01-22
host: x86_64-unknown-linux-gnu
release: 1.86.0-nightly
LLVM version: 19.1.7
```

### Anything else?

cc @estebank as they expressed interested in such cases