ices/81804.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#81804

fn p([=(}

=== stdout ===
=== stderr ===
error: this file contains an unclosed delimiter
 --> /home/runner/work/glacier/glacier/ices/81804.rs:1:11
  |
1 | fn p([=(}
  |     --    ^
  |     ||
  |     |unclosed delimiter
  |     unclosed delimiter

error: expected pattern, found `=`
 --> /home/runner/work/glacier/glacier/ices/81804.rs:1:7
  |
1 | fn p([=(}
  |       ^ expected pattern

error: expected one of `)`, `,`, `->`, `;`, `where`, or `{`, found `]`
 --> /home/runner/work/glacier/glacier/ices/81804.rs:1:11
  |
1 | fn p([=(}
  |        - -^
  |        | |
  |        | help: `)` may belong here
  |        unclosed delimiter

error: expected item, found `]`
 --> /home/runner/work/glacier/glacier/ices/81804.rs:1:11
  |
1 | fn p([=(}
  |           ^ expected item

error: aborting due to 4 previous errors

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