error: expected identifier, found number literal
  --> $DIR/issue-104088.rs:6:9
   |
LL |     let 1x = 123;
   |         ^^ identifiers cannot start with a number

error: expected identifier, found number literal
  --> $DIR/issue-104088.rs:11:9
   |
LL |     let 2x: i32 = 123;
   |         ^^ identifiers cannot start with a number

error: expected identifier, found number literal
  --> $DIR/issue-104088.rs:22:9
   |
LL |     let 23name = 123;
   |         ^^^^^^ identifiers cannot start with a number

error[E0308]: mismatched types
  --> $DIR/issue-104088.rs:16:12
   |
LL |     if let 2e1 = 123 {
   |            ^^^   --- this expression has type `{integer}`
   |            |
   |            expected integer, found floating-point number

error: aborting due to 4 previous errors

For more information about this error, try `rustc --explain E0308`.