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bug#46670: 28.0.50; [feature/native-comp] possible miscompilation affect
From: |
Mauricio Collares |
Subject: |
bug#46670: 28.0.50; [feature/native-comp] possible miscompilation affecting lsp-mode |
Date: |
Sat, 20 Feb 2021 21:12:11 -0300 |
This was found by Anthony Cowley, who isolated the exact function in
lsp-mode that was misbehaving. I verified that I could reproduce this
findings, and then I removed surrounding context to obtain a minimized
testcase. If this fails to reproduce, it's entirely my fault.
Steps to reproduce:
1) Put this in minimized.el:
;;; -*- lexical-binding: t; -*-
(defun minimized--look-back (s)
(and (equal (buffer-substring-no-properties (- (point) (length s)) (point))
s)
s))
(defun minimized-go ()
(interactive)
(message (minimized--look-back ".")))
(provide 'minimized)
2) Type "." in a buffer and then run minimized-go with the point after
the period. This prints back "." in the minibuffer if the code's
interpreted but not if it's native-compiled.
Note that removing the "lexical-binding: t" line makes the bug not
reproduce. Replacing "(- (point) (length s))" by "(1- (point))" also
makes the bug disappear.
Best,
Mauricio
- bug#46670: 28.0.50; [feature/native-comp] possible miscompilation affecting lsp-mode,
Mauricio Collares <=
- bug#46670: 28.0.50; [feature/native-comp] possible miscompilation affecting lsp-mode, Pip Cet, 2021/02/21
- bug#46670: 28.0.50; [feature/native-comp] possible miscompilation affecting lsp-mode, Pip Cet, 2021/02/21
- bug#46670: 28.0.50; [feature/native-comp] possible miscompilation affecting lsp-mode, Andrea Corallo, 2021/02/21
- bug#46670: 28.0.50; [feature/native-comp] possible miscompilation affecting lsp-mode, Pip Cet, 2021/02/21
- bug#46670: 28.0.50; [feature/native-comp] possible miscompilation affecting lsp-mode, Andrea Corallo, 2021/02/22
- bug#46670: 28.0.50; [feature/native-comp] possible miscompilation affecting lsp-mode, Pip Cet, 2021/02/22
- bug#46670: 28.0.50; [feature/native-comp] possible miscompilation affecting lsp-mode, Pip Cet, 2021/02/22
- bug#46670: 28.0.50; [feature/native-comp] possible miscompilation affecting lsp-mode, Andrea Corallo, 2021/02/22
- bug#46670: 28.0.50; [feature/native-comp] possible miscompilation affecting lsp-mode, Pip Cet, 2021/02/22
- bug#46670: 28.0.50; [feature/native-comp] possible miscompilation affecting lsp-mode, Andrea Corallo, 2021/02/22