1.4.0 gets parse error on bootstrap mixins.less

[ptte]

Getting ParseError on bootstrap mixins, confirmed that it was working in 1.3.3

Error

ParseError: Unrecognised input in /.../bootstrap/mixins.less on line 562, column 7:
561     .spanX (@index) when (@index > 0) {
562       (~".span@{index}") { .span(@index); }
563       .spanX(@index - 1);

Reproduce

Using bootstrap version 2.2.1

Create a compile file (lol.less)

// Core variables and mixins
@import "variables.less";
@import "mixins.less";

Compile it

lessc lol.less lol.css

Voila. Error.

[jonschlinkert]

I suggest using 1.3.3 for Bootstrap 2.x. Alternatively you can update the mixin to work with 1.4.0.

[lukeapage]

one of the bootstrap 2.x releases contains a fix for this. So the latest 2.x works in 1.4

[jonschlinkert]

Yeah, actually what version of Bootstrap is this? I think this is 2.3.0, because this should be fixed in Bootstrap 2.3.1 (per @lukeapage's pull request that was merged)

[lukeapage]

thanks @jonschlinkert for filling in the numbers!

[juliotaylor]

Hi guys, just to confirm replacing mixins.less from an old build of Bootstrap with the latest (2.3.2) fixes this issue.

Thanks very much for your help, all

[nicolas-bastien]

👍 Thanks for the solution

[JohnONeill]

For those who want to manually update their mixin file themselves, simply update the string interpolation syntax:

Found here within the 1.4.0 section (search for 'breaking changes').