error: field index 5 out of range of 2 fields:
       At "{5} {x} {} {} {b} {} {} {b}"
            ^
 --> tests/fail/stable/derive_placeholders.rs:2:19
  |
2 | #[sscanf(format = "{5} {x} {} {} {b} {} {} {b}")]
  |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: field `x` does not exist:
       At "{5} {x} {} {} {b} {} {} {b}"
                ^
 --> tests/fail/stable/derive_placeholders.rs:2:19
  |
2 | #[sscanf(format = "{5} {x} {} {} {b} {} {} {b}")]
  |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: field `b` has multiple sources:
       At "{5} {x} {} {} {b} {} {} {b}"
                         ^^^
 --> tests/fail/stable/derive_placeholders.rs:2:19
  |
2 | #[sscanf(format = "{5} {x} {} {} {b} {} {} {b}")]
  |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: field `b` has multiple sources:
       At "{5} {x} {} {} {b} {} {} {b}"
                                   ^^^
 --> tests/fail/stable/derive_placeholders.rs:2:19
  |
2 | #[sscanf(format = "{5} {x} {} {} {b} {} {} {b}")]
  |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: too many placeholders:
       At "{5} {x} {} {} {b} {} {} {b}"
                      ^^
 --> tests/fail/stable/derive_placeholders.rs:2:19
  |
2 | #[sscanf(format = "{5} {x} {} {} {b} {} {} {b}")]
  |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: too many placeholders:
       At "{5} {x} {} {} {b} {} {} {b}"
                             ^^
 --> tests/fail/stable/derive_placeholders.rs:2:19
  |
2 | #[sscanf(format = "{5} {x} {} {} {b} {} {} {b}")]
  |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: too many placeholders:
       At "{5} {x} {} {} {b} {} {} {b}"
                                ^^
 --> tests/fail/stable/derive_placeholders.rs:2:19
  |
2 | #[sscanf(format = "{5} {x} {} {} {b} {} {} {b}")]
  |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: field `b` has multiple sources
  --> tests/fail/stable/derive_placeholders.rs:12:14
   |
12 |     #[sscanf(default = 5)]
   |              ^^^^^^^^^^^

error: field `b` has multiple sources:
       At "{b}"
           ^^^
 --> tests/fail/stable/derive_placeholders.rs:9:19
  |
9 | #[sscanf(format = "{b}")]
  |                   ^^^^^

error: FromScanf: field `a` is not specified in the format string and has no default value. You must specify exactly one of these.
       The syntax for default values is: `#[sscanf(default)]` to use Default::default() or `#[sscanf(default = ...)]` to provide a custom value.
  --> tests/fail/stable/derive_placeholders.rs:11:5
   |
11 |     a: u8,
   |     ^