cannot compile with multiline strings

[TheRealDxRed]

Zig Version

0.11.0-dev.1507+6f13a725a

Steps to Reproduce and Observed Behavior

Compile the following source file

const std = @import("std");

pub fn main() void {
    std.debug.print(
        \\Hello World
        \\
        ,
        .{}
    );
}

which will result in an error about a poorly terminated symbol instead of a multi line string.

src\main.zig:5:16: error: expected ',' after argument
  \\Hello World
               ^~~~
src\main.zig:6:3: note: invalid byte: '\\'
  \\
  ^

Expected Behavior

The lines beginning with doubled backslashes should have been read as multiline strings, as per 5.3.2. Multiline String Literals

[squeek502]

Can't reproduce this.

$ ./zig-linux-x86_64-0.11.0-dev.1507+6f13a725a/zig run 14513.zig
Hello World

where 14513.zig contains the code from the OP.

EDIT: It's possible that Windows line endings (CRLF) are causing this. If I convert the file to use CRLF line endings, I get a similar compile error:

14513.zig:5:22: error: expected ',' after argument
        \\Hello World
                     ^~~~
14513.zig:6:3: note: invalid byte: ' '
        \\
  ^

Make sure you are using unix-style (LF) line endings. I'm unsure of the status of line-ending stuff, though, so I'm not sure if this is a bad/misleading error message or a bug.

EDIT#2: Was able to get an exact reproduction with hard tabs before the second \\ line in addition to the CRLF line endings:

const std = @import("std");

pub fn main() void {
    std.debug.print(
        \\Hello World
<\t><\t>\\
        ,
        .{}
    );
}

where <\t> are hard tab characters. See the Source Encoding section of the lang ref for recommendations about avoiding CRLF and hard tabs.

---

The error message here should definitely be improved, though; additionally, I hit an unreachable when trying to run zig fmt on the file with CRLF line endings:

$ unix2dos 14513.zig
unix2dos: converting file 14513.zig to DOS format...
$ zig fmt 14513.zig
thread 3909774 panic: reached unreachable code
/home/ryan/Programming/zig/zig/lib/std/debug.zig:281:14: 0x989fb6 in assert (zig)
    if (!ok) unreachable; // assertion failure
             ^
/home/ryan/Programming/zig/zig/lib/std/zig/Ast.zig:120:17: 0xab536c in tokenSlice (zig)
    assert(token.tag == token_tag);
                ^
/home/ryan/Programming/zig/zig/src/main.zig:4678:77: 0xb5c788 in printErrsMsgToStdErr (zig)
            const bad_off = @intCast(u32, tree.tokenSlice(parse_error.token + @boolToInt(parse_error.token_is_prev)).len);
                                                                            ^
/home/ryan/Programming/zig/zig/src/main.zig:4572:83: 0xdc61cb in fmtPathFile (zig)
    try printErrsMsgToStdErr(fmt.gpa, fmt.arena, tree.errors, tree, file_path, fmt.color);
                                                                                  ^
/home/ryan/Programming/zig/zig/src/main.zig:4494:16: 0xb601ec in fmtPath (zig)
    fmtPathFile(fmt, file_path, check_mode, dir, sub_path) catch |err| switch (err) {
               ^
/home/ryan/Programming/zig/zig/src/main.zig:4458:56: 0x9b9c75 in cmdFmt (zig)
        try fmtPath(&fmt, file_path, check_flag, fs.cwd(), file_path);
                                                       ^
/home/ryan/Programming/zig/zig/src/main.zig:296:22: 0x987fc7 in mainArgs (zig)
        return cmdFmt(gpa, arena, cmd_args);
                     ^
/home/ryan/Programming/zig/zig/src/main.zig:207:20: 0x986b15 in main (zig)
    return mainArgs(gpa, arena, args);
                   ^
/home/ryan/Programming/zig/zig/lib/std/start.zig:616:37: 0x9891f7 in main (zig)
            const result = root.main() catch |err| {
                                    ^
???:?:?: 0x7fffed1d2082 in ??? (???)
Aborted

[Vexu]

Duplicate of #11414