Commit: runtime(rust): Update indentation after nested array literal

[Christian Brabandt]

runtime(rust): Update indentation after nested array literal

Commit: https://github.com/vim/vim/commit/5c2b594d0e86e4484cc92bd415aedbef5749bd9e
Author: Brian Carbone <br...@briancarbone.com>
Date: Wed Dec 31 09:24:31 2025 +0000

runtime(rust): Update indentation after nested array literal

fixes: https://github.com/vim/vim/issues/18974
closes: https://github.com/vim/vim/issues/19042

Signed-off-by: Brian Carbone <br...@briancarbone.com>
Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/indent/rust.vim b/runtime/indent/rust.vim
index 662c9e766..30206be43 100644
--- a/runtime/indent/rust.vim
+++ b/runtime/indent/rust.vim
@@ -4,6 +4,7 @@
" Last Change: 2023-09-11
" 2024 Jul 04 by Vim Project: use shiftwidth() instead of hard-coding shifted values #15138
" 2025 Dec 29 by Vim Project: clean up
+" 2025 Dec 31 by Vim Project: correcly indent after nested array literal #19042

" For bugs, patches and license go to https://github.com/rust-lang/rust.vim
" Note: upstream seems umaintained: https://github.com/rust-lang/rust.vim/issues/502
@@ -195,6 +196,22 @@ function GetRustIndent(lnum)
endif
endif

+ " Prevent cindent from becoming confused when pairing square brackets, as
+ " in
+ "
+ " let arr = [[u8; 4]; 2] = [
+ " [0; 4],
+ " [1, 3, 5, 9],
+ " ];
+ " | ← indentation placed here
+ "
+ " for which it calculates too much indentation in the line following the
+ " close of the array.
+ if prevline =~# '^\s*\]' && l:last_prevline_character ==# ';'
+ \ && line !~# '^\s*}'
+ return indent(prevlinenum)
+ endif
+
if l:last_prevline_character ==# ","
\ && s:get_line_trimmed(a:lnum) !~# '^\s*[\[\]{})]'
\ && prevline !~# '^\s*fn\s'
diff --git a/runtime/indent/testdir/rust.in b/runtime/indent/testdir/rust.in
index 848912bfb..28a68924f 100644
--- a/runtime/indent/testdir/rust.in
+++ b/runtime/indent/testdir/rust.in
@@ -15,6 +15,21 @@ fn main() {
Ok(file) => file,
};

+ // Start doing nothing forever
+ loop {
+ let arr1 = [[u8; 4]; 2] = [
+ [0; 4],
+ [1, 3, 5, 9],
+ ];
+ }
+
+ // Plan for a future that will never come
+ let arr2 = [[u8; 4]; 2] = [
+ [1; 4],
+ [2, 4, 6, 8],
+ ];
+ let arr2_ref = &arr2;
+
// Read the file contents into a string, returns `io::Result<usize>`
let mut s = String::new();
match file.read_to_string(&mut s) {
diff --git a/runtime/indent/testdir/rust.ok b/runtime/indent/testdir/rust.ok
index ea2a071b0..04808e224 100644
--- a/runtime/indent/testdir/rust.ok
+++ b/runtime/indent/testdir/rust.ok
@@ -15,6 +15,21 @@ fn main() {
Ok(file) => file,
};

+ // Start doing nothing forever
+ loop {
+ let arr1 = [[u8; 4]; 2] = [
+ [0; 4],
+ [1, 3, 5, 9],
+ ];
+ }
+
+ // Plan for a future that will never come
+ let arr2 = [[u8; 4]; 2] = [
+ [1; 4],
+ [2, 4, 6, 8],
+ ];
+ let arr2_ref = &arr2;
+
// Read the file contents into a string, returns `io::Result<usize>`
let mut s = String::new();
match file.read_to_string(&mut s) {