sass问题

[ZongDuCha]

sass 错误代码：
/*
Error: Invalid CSS after "*": expected selector, was "{"
on line 6 of sass/index.sass

1: $width:100%
2:
3:
4: $height:20px
5:
6: *{
7: margin:0;
8: padding:0
9: }

Backtrace:
sass/index.sass:6
C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/scss/parser.rb:1278:in expected' C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/scss/parser.rb:1208:in expected'
C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/scss/static_parser.rb:21:in parse_selector' C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/tree/visitors/perform.rb:438:in visit_rule'
C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/tree/visitors/base.rb:36:in visit' C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/tree/visitors/perform.rb:162:in block in visit'
C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/stack.rb:79:in block in with_base' C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/stack.rb:135:in with_frame'
C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/stack.rb:79:in with_base' C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/tree/visitors/perform.rb:162:in visit'
C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/tree/visitors/base.rb:52:in block in visit_children' C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/tree/visitors/base.rb:52:in map'
C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/tree/visitors/base.rb:52:in visit_children' C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/tree/visitors/perform.rb:171:in block in visit_children'
C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/tree/visitors/perform.rb:183:in with_environment' C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/tree/visitors/perform.rb:170:in visit_children'
C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/tree/visitors/base.rb:36:in block in visit' C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/tree/visitors/perform.rb:190:in visit_root'
C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/tree/visitors/base.rb:36:in visit' C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/tree/visitors/perform.rb:161:in visit'
C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/tree/visitors/perform.rb:10:in visit' C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/tree/root_node.rb:36:in css_tree'
C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/tree/root_node.rb:29:in render_with_sourcemap' C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/engine.rb:389:in _render_with_sourcemap'
C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/engine.rb:307:in render_with_sourcemap' C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/plugin/compiler.rb:462:in update_stylesheet'
C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/plugin/compiler.rb:215:in block in update_stylesheets' C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/plugin/compiler.rb:209:in each'
C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/plugin/compiler.rb:209:in update_stylesheets' C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/plugin/compiler.rb:443:in on_file_changed'
C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-3.5.2/lib/sass/plugin/compiler.rb:320:in block in watch' C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-listen-4.0.0/lib/sass-listen/event/config.rb:23:in call'
C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-listen-4.0.0/lib/sass-listen/event/processor.rb:115:in _process_changes' C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-listen-4.0.0/lib/sass-listen/event/processor.rb:19:in block in loop_for'
C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-listen-4.0.0/lib/sass-listen/event/processor.rb:15:in loop' C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-listen-4.0.0/lib/sass-listen/event/processor.rb:15:in loop_for'
C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-listen-4.0.0/lib/sass-listen/event/loop.rb:84:in _wait_for_changes' C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-listen-4.0.0/lib/sass-listen/event/loop.rb:42:in block in setup'
C:/Ruby24/lib/ruby/gems/2.4.0/gems/sass-listen-4.0.0/lib/sass-listen/internals/thread_pool.rb:6:in `block in add'
/
body:before {
white-space: pre;
font-family: monospace;
content: "Error: Invalid CSS after "": expected selector, was "{"\A on line 6 of sass/index.sass\A \A 1: $width:100%\A 2: \A 3: \A 4: $height:20px\A 5: \A 6: *{\A 7: margin:0;\A 8: padding:0\A 9: }"; }

sass里的代码:
$width:100%

$height:20px

*{
margin:0;
padding:0
}

// 那位知道是什么原因吗？