Rustdoc will report warnings multiple times for reference links

[jyn514]

I tried this code:

/// docs [label][with#anchor#error]
pub struct S;

I expected to see this happen: rustdoc outputs a single warning that only 1 anchor is allowed

Instead, this happened: rustdoc outputs the same warning twice in a row:

warning: `[with#anchor#error]` has an issue with the link anchor.
  --> $DIR/reference-link-has-one-warning.rs:3:18
   |
LL | /// docs [label][with#anchor#error]
   |                  ^^^^^^^^^^^^^^^^^ only one `#` is allowed in a link
   |
   = note: `#[warn(intra_doc_link_resolution_failure)]` on by default

warning: `[with#anchor#error]` has an issue with the link anchor.
  --> $DIR/reference-link-has-one-warning.rs:3:18
   |
LL | /// docs [label][with#anchor#error]
   |                  ^^^^^^^^^^^^^^^^^ only one `#` is allowed in a link

warning: 2 warnings emitted

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rustc --version --verbose:

<version>

@rustbot modify labels: T-rustdoc A-intra-doc-links

[jyn514]

This is because of pulldown-cmark/pulldown-cmark#444 and has to be fixed upstream AFAIK. I opened a WIP: pulldown-cmark/pulldown-cmark#445