[Bug 2132631] [NEW] Incorrect patch stub format causes dh-cargo-vendored-sources to fail

[Max Gilmour]

Public bug reported:

Starting in rustc-1.89, cargo-vendor-filterer was used to automatically
generate crate stubs for unwanted vendored dependencies.

However, dh-cargo-vendored-sources checks for an empty src/lib.rs to
determine whether or not a given crate is a stub, and the patch used to
generate the crate stubs contains a single newline, making dh-cargo-
vendored-sources erroneously believe these crates were indeed included
in the source.

** Affects: rustc-1.89 (Ubuntu)
     Importance: Undecided
     Assignee: Max Gilmour (maxgmr)
         Status: In Progress

** Package changed: rustc-1.88 (Ubuntu) => rustc-1.89 (Ubuntu)

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https://bugs.launchpad.net/bugs/2132631

Title:
  Incorrect patch stub format causes dh-cargo-vendored-sources to fail

Status in rustc-1.89 package in Ubuntu:
  In Progress

Bug description:
  Starting in rustc-1.89, cargo-vendor-filterer was used to
  automatically generate crate stubs for unwanted vendored dependencies.

  However, dh-cargo-vendored-sources checks for an empty src/lib.rs to
  determine whether or not a given crate is a stub, and the patch used
  to generate the crate stubs contains a single newline, making dh-
  cargo-vendored-sources erroneously believe these crates were indeed
  included in the source.

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