zig fmt freeze and memory leak

[xor-bits]

Zig Version

0.15.0-dev.386+2e35fdd03

Steps to Reproduce and Observed Behavior

run zig fmt main.zig on:

// main.zig
fn main() void {
    asm volatile (
        \\
        ++ ""
        :
        : [args] "r" (args),
    );
}

The formatter hangs and starts leaking memory until OOM killer kills it or you kill it manually

The compiler itself is fine with it (not this minimal reproducible example) but the formatter specifically isn't. Example where the code compiles but the formatter crashes: link.

Also happens on 0.14.0

Expected Behavior

The formatter should format the file like normal and exit

[Rexicon226]

thread 63160664 panic: reached unreachable code
/Users/david/Code/zig/lib/std/debug.zig:550:14: 0x1025c38df in assert (zig)
    if (!ok) unreachable; // assertion failure                                                                                                              ^
/Users/david/Code/zig/lib/std/zig/render.zig:3340:23: 0x103106ff7 in setIndentDelta (zig)
                assert((self.indent_count * self.indent_delta) % new_indent_delta == 0);
                      ^
/Users/david/Code/zig/lib/std/zig/render.zig:2500:35: 0x102dba917 in renderAsm (zig)
                ais.setIndentDelta(indent_delta);
                                  ^                                                                                                            /Users/david/Code/zig/lib/std/zig/render.zig:869:28: 0x102a8469b in renderExpression (zig)
        => return renderAsm(r, tree.fullAsm(node).?, space),
                           ^
/Users/david/Code/zig/lib/std/zig/render.zig:1956:41: 0x1030ffe57 in finishRenderBlock (zig)
            else => try renderExpression(r, stmt, .semicolon),
                                        ^
/Users/david/Code/zig/lib/std/zig/render.zig:1934:29: 0x102dabebf in renderBlock (zig)                                                             return finishRenderBlock(r, block_node, statements, space);
                            ^
/Users/david/Code/zig/lib/std/zig/render.zig:388:31: 0x102a8292b in renderExpression (zig)
            return renderBlock(r, node, statements, space);
                              ^
/Users/david/Code/zig/lib/std/zig/render.zig:229:40: 0x102da7c17 in renderMember (zig)
                return renderExpression(r, body_node, space);                                                                                                                         ^
/Users/david/Code/zig/lib/std/zig/render.zig:124:21: 0x102a7ec73 in renderMembers (zig)
    try renderMember(r, container, members[0], .newline);
                    ^
/Users/david/Code/zig/lib/std/zig/render.zig:102:34: 0x1028d913b in renderTree (zig)
        .zig => try renderMembers(&r, tree.rootDecls()),
                                 ^                                                                                                             /Users/david/Code/zig/lib/std/zig/Ast.zig:213:46: 0x1027d5bcb in renderToArrayList (zig)
    return @import("./render.zig").renderTree(buffer, tree, fixups);
                                             ^