Bootstrap 2.3's mixin.less incompatibilities.

gistfile1.diff

@@ -558,13 +567,13 @@
   .core (@gridColumnWidth, @gridGutterWidth) {
 
     .spanX (@index) when (@index > 0) {
-      (~".span@{index}") { .span(@index); }
+      .span@{index} { .span(@index); }
       .spanX(@index - 1);
     }
     .spanX (0) {}
 
     .offsetX (@index) when (@index > 0) {
-      (~".offset@{index}") { .offset(@index); }
+      .offset@{index} { .offset(@index); }
       .offsetX(@index - 1);
     }
     .offsetX (0) {}
@@ -603,14 +612,14 @@
   .fluid (@fluidGridColumnWidth, @fluidGridGutterWidth) {
 
     .spanX (@index) when (@index > 0) {
-      (~".span@{index}") { .span(@index); }
+      .span@{index} { .span(@index); }
       .spanX(@index - 1);
     }
     .spanX (0) {}
 
     .offsetX (@index) when (@index > 0) {
-      (~'.offset@{index}') { .offset(@index); }
-      (~'.offset@{index}:first-child') { .offsetFirstChild(@index); }
+      .offset@{index} { .offset(@index); }
+      .offset@{index}:first-child { .offsetFirstChild(@index); }
       .offsetX(@index - 1);
     }
     .offsetX (0) {}
@@ -658,7 +667,7 @@
   .input(@gridColumnWidth, @gridGutterWidth) {
 
     .spanX (@index) when (@index > 0) {
-      (~"input.span@{index}, textarea.span@{index}, .uneditable-input.span@{index}") { .span(@index); }
+      input.span@{index}, textarea.span@{index}, .uneditable-input.span@{index} { .span(@index); }
       .spanX(@index - 1);
     }
     .spanX (0) {}

Tks a lot, that fix my bootstrapwp-Twitter-Bootstrap-for-WordPress, from compile

you, sir... are my hero of the day, thank you for this fix.

Yay! Good Work!

Great fix.

Thank you. Saved me a headache.

Excellent, thanks!