Bug report

#148566 allowed this:

match ...:
    case +1j:
        pass

but also this:

match ...:
    case 1++1j:
        pass

The double plus should not be allowed.

Linked PRs

• gh-154775: Don't accept duplicate plus sign when matching complex number #154776
• [3.15] gh-154775: Don't accept duplicate plus sign when matching complex number (GH-154776) #154802