About less loop, throw error - 


.loop (@start, @end, @step, @classname,@propertyname) when (@start < @end) {   .@{classname}-@{start} {     @{propertyname}: @start * 1px;   }   .loop (@start + @step, @end, @step, @classname, @propertyname); }   .loop(12,48,2,fs,font-size);

i want loop css common class,but throw error,i don't error on. example:

.fs-12{ font-size:12px; }  .fs-13{ font-size:13px; }  .mt-13{ margin-top:13px; } 

.loop (@start, @end, @step, @classname,@propertyname) when (@start < @end) {   .@{classname}-@{start} {     @{propertyname}: (@start * 1px);   }   .loop ((@start + @step), @end, @step, @classname, @propertyname); }     .loop(12,48,2, fs, font-size);

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