Comparing String < {number} gives subpar suggestion and comparisons don't point at source of E0308 expectation

[estebank]

When writing string < number, the current output is:

error[E0308]: mismatched types
 --> src/main.rs:2:29
  |
2 |     let _ = String::new() < 42;
  |                             ^^- help: try using a conversion method: `.to_string()`
  |                             |
  |                             expected struct `String`, found integer

but it should be closer to

error[E0308]: mismatched types
 --> src/main.rs:2:29
  |
2 |     let _ = String::new() < 42;
  |             -------------   ^^ expected struct `String`, found integer
  |             |               
  |             expected because of this
  |
help: you might have meant to compare the string's length
2 |     let _ = String::new().len() < 42;
  |                          ++++++

[SNCPlay42]

Related: #77304

[chenyukang]

how do we determine should try to convert from RHS to LHS, or from LHS to RHS..
from this case, since the RHS is already a primitive type, so we convert type from LHS?