From 7dfd525c8dc5e49ada7f545a720a7e874cff1ec3 Mon Sep 17 00:00:00 2001
From: bibonix <bibonix@users.noreply.github.com>
Date: Sun, 3 May 2026 04:24:33 +0000
Subject: [PATCH 1/2] test(#640): add failing pack reproducing chained-dot self
 usage

The redundant-object lint flags 'self' as redundant when it is reached
via a chained dot reference like '(...).self', because the usage XPath
only matches '@base' values prefixed with 'xi(.rho)*'. The new pack
exercises exactly that shape and currently fails.
---
 .../allows-self-used-via-chained-dot.yaml       | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 src/test/resources/org/eolang/lints/packs/single/redundant-object/allows-self-used-via-chained-dot.yaml

diff --git a/src/test/resources/org/eolang/lints/packs/single/redundant-object/allows-self-used-via-chained-dot.yaml b/src/test/resources/org/eolang/lints/packs/single/redundant-object/allows-self-used-via-chained-dot.yaml
new file mode 100644
index 000000000..90e59a665
--- /dev/null
+++ b/src/test/resources/org/eolang/lints/packs/single/redundant-object/allows-self-used-via-chained-dot.yaml
@@ -0,0 +1,17 @@
+# SPDX-FileCopyrightText: Copyright (c) 2016-2026 Objectionary.com
+# SPDX-License-Identifier: MIT
+---
+sheets:
+  - /org/eolang/lints/misc/redundant-object.xsl
+asserts:
+  - /defects[count(defect)=0]
+input: |
+  # Bytes as input.
+  [bts] > bytes-as-input
+    # Read 'size' amount of bytes from 'bts'.
+    [size] > read
+      ((input-block bts --).read size).self > @
+      # Bytes-as-input block.
+      [data buffer] > input-block
+        buffer > @
+        $ > self

From f7d3d5e21bb1d3df73aa96daa9149bdb601fe9a7 Mon Sep 17 00:00:00 2001
From: bibonix <bibonix@users.noreply.github.com>
Date: Sun, 3 May 2026 04:43:43 +0000
Subject: [PATCH 2/2] fix(#640): allow chained-dot usage of $-aliased
 attributes
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

When an attribute is declared as a $-alias (`$ > name`) and the only
reference to it appears as a chained method call (`(...).name`), the
parser emits the usage as `<o base=".name"/>`, which the previous
`^ξ(?:\.ρ)*\.<name>(?:\.[\w-]+)*$` regex never matched. The lint
therefore counted zero usages and flagged the attribute as redundant,
even though inlining it (`(...).$`) is not valid EO.

Add a second regex matching the chained-dot form and suppress the
warning when the candidate is a $-alias and at least one such usage
exists. Same-level redundant aliases stay flagged because their usages
still appear under the `ξ.<name>` form.
---
 src/main/resources/org/eolang/lints/misc/redundant-object.xsl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/main/resources/org/eolang/lints/misc/redundant-object.xsl b/src/main/resources/org/eolang/lints/misc/redundant-object.xsl
index 3a09f8775..73708188a 100644
--- a/src/main/resources/org/eolang/lints/misc/redundant-object.xsl
+++ b/src/main/resources/org/eolang/lints/misc/redundant-object.xsl
@@ -13,7 +13,8 @@
       <xsl:variable name="top" select="/object/o/generate-id()"/>
       <xsl:for-each select="//o[generate-id() != $top and @name and @name != 'φ' and @base and @base != '∅' and not(@base='ξ' and @name='xi🌵')]">
         <xsl:variable name="usage" select="concat('^ξ(?:\.ρ)*\.', @name, '(?:\.[\w-]+)*$')"/>
-        <xsl:if test="count(//o[matches(@base, $usage)])&lt;=1 and not(@name and o[1]/@base = 'Φ.dataized')">
+        <xsl:variable name="chained-usage" select="concat('^\.', @name, '(?:\.[\w-]+)*$')"/>
+        <xsl:if test="count(//o[matches(@base, $usage)])&lt;=1 and not(@base='ξ' and count(//o[matches(@base, $chained-usage)])&gt;=1) and not(@name and o[1]/@base = 'Φ.dataized')">
           <xsl:element name="defect">
             <xsl:variable name="line" select="eo:lineno(@line)"/>
             <xsl:attribute name="line">