I'm a little bit confused why the diffs are equal to each other,
ASAICS, the changed code removed the effect of 'flags'?

Can you explain a little bit since I just began to read the code base :)

2018-03-07 23:29 GMT+08:00 Ruslan Ermilov <r...@nginx.com>:
> details:   http://hg.nginx.org/nginx/rev/0b1eb40de6da
> branches:
> changeset: 7226:0b1eb40de6da
> user:      Ruslan Ermilov <r...@nginx.com>
> date:      Wed Mar 07 18:28:12 2018 +0300
> description:
> Improved code readablity.
>
> No functional changes.
>
> diffstat:
>
>  src/http/ngx_http_variables.c     |  8 ++++++--
>  src/stream/ngx_stream_variables.c |  8 ++++++--
>  2 files changed, 12 insertions(+), 4 deletions(-)
>
> diffs (50 lines):
>
> diff -r e80930e5e422 -r 0b1eb40de6da src/http/ngx_http_variables.c
> --- a/src/http/ngx_http_variables.c     Mon Mar 05 21:35:13 2018 +0300
> +++ b/src/http/ngx_http_variables.c     Wed Mar 07 18:28:12 2018 +0300
> @@ -429,7 +429,9 @@ ngx_http_add_variable(ngx_conf_t *cf, ng
>              return NULL;
>          }
>
> -        v->flags &= flags | ~NGX_HTTP_VAR_WEAK;
> +        if (!(flags & NGX_HTTP_VAR_WEAK)) {
> +            v->flags &= ~NGX_HTTP_VAR_WEAK;
> +        }
>
>          return v;
>      }
> @@ -494,7 +496,9 @@ ngx_http_add_prefix_variable(ngx_conf_t
>              return NULL;
>          }
>
> -        v->flags &= flags | ~NGX_HTTP_VAR_WEAK;
> +        if (!(flags & NGX_HTTP_VAR_WEAK)) {
> +            v->flags &= ~NGX_HTTP_VAR_WEAK;
> +        }
>
>          return v;
>      }
> diff -r e80930e5e422 -r 0b1eb40de6da src/stream/ngx_stream_variables.c
> --- a/src/stream/ngx_stream_variables.c Mon Mar 05 21:35:13 2018 +0300
> +++ b/src/stream/ngx_stream_variables.c Wed Mar 07 18:28:12 2018 +0300
> @@ -161,7 +161,9 @@ ngx_stream_add_variable(ngx_conf_t *cf,
>              return NULL;
>          }
>
> -        v->flags &= flags | ~NGX_STREAM_VAR_WEAK;
> +        if (!(flags & NGX_STREAM_VAR_WEAK)) {
> +            v->flags &= ~NGX_STREAM_VAR_WEAK;
> +        }
>
>          return v;
>      }
> @@ -227,7 +229,9 @@ ngx_stream_add_prefix_variable(ngx_conf_
>              return NULL;
>          }
>
> -        v->flags &= flags | ~NGX_STREAM_VAR_WEAK;
> +        if (!(flags & NGX_STREAM_VAR_WEAK)) {
> +            v->flags &= ~NGX_STREAM_VAR_WEAK;
> +        }
>
>          return v;
>      }
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