Hello Vim developers; there's a set of parentheses in src/drawline.c unbalanced around the preprocessor conditional for FEAT_DIFF that prevent compilation with the feature disabled. A patch is attached.

--
Tom Ryder <https://sanctum.geek.nz/>

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>From 0a107961e6d95b3ef1e786e9c2e826388f4fb759 Mon Sep 17 00:00:00 2001
From: Tom Ryder <[email protected]>
Date: Sun, 12 Apr 2020 00:35:44 +1200
Subject: [PATCH] Correct compilation error with -diff

With FEAT_DIFF undefined, the parentheses in this block end up
imbalanced in the preprocessed code.
---
 src/drawline.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/drawline.c b/src/drawline.c
index 1544dae28..8de307aa6 100644
--- a/src/drawline.c
+++ b/src/drawline.c
@@ -3095,9 +3095,9 @@ win_line(
 #ifdef FEAT_SYN_HL
            if (!(cul_screenline
 # ifdef FEAT_DIFF
-                       && diff_hlf == (hlf_T)0)
+                       && diff_hlf == (hlf_T)0
 # endif
-                   )
+                   ))
                saved_char_attr = char_attr;
            else
 #endif
-- 
2.20.1

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