PR Summary

The confusing-naming rule was incorrectly reporting false positives when Go structs contained multiple blank identifier (_) fields, which are commonly used for padding and alignment. The rule's checkStructFields function was treating all field names equally, including blank identifiers, causing it to flag the second occurrence of _ as differing only by capitalization from the first. This fix adds a simple check to skip blank identifiers before performing the capitalization comparison, as blank identifiers are special in Go and explicitly allowed to appear multiple times in the same struct according to the language specification.

Example:

// test.go
package main

type siginfoChild struct {
    signo    int32
    errno    int32
    exitCode int32
    _        int32

    pid    int32
    uid    uint32
    status int32

    _ [25]uint32 // Pad to 128 bytes
}

Old output:

Field '_' differs only by capitalization to other field in the struct type siginfoChild

Fixes #1535.