allow control flow inside @content

src/atrule/mixin.rs

@@ -4,7 +4,7 @@ use codemap::Spanned;
 
 use peekmore::{PeekMore, PeekMoreIterator};
 
-use super::eat_stmts;
+use super::ruleset_eval;
 
 use crate::args::{eat_call_args, eat_func_args, CallArgs, FuncArgs};
 use crate::atrule::AtRule;
@@ -223,18 +223,28 @@ pub(crate) fn eat_include<I: Iterator<Item = Token>>(
 
     devour_whitespace(toks);
 
-    let content = if let Some(tok) = toks.peek() {
+    let mut content = Vec::new();
+
+    if let Some(tok) = toks.peek() {
         if tok.kind == '{' {
             toks.next();
-            eat_stmts(toks, &mut scope.clone(), super_selector, false)?
+            ruleset_eval(
+                toks,
+                &mut scope.clone(),
+                super_selector,
+                false,
+                &mut content,
+            )?;
         } else if has_content {
-            eat_stmts(toks, &mut scope.clone(), super_selector, false)?
+            ruleset_eval(
-        } else {
+                toks,
-            Vec::new()
+                &mut scope.clone(),
+                super_selector,
+                false,
+                &mut content,
+            )?;
+        }
     }
-    } else {
-        Vec::new()
-    };
 
     let mixin = scope.get_mixin(name)?;
 

tests/mixins.rs

@@ -199,3 +199,8 @@ test!(
     "@mixin foo($a_b) {\n  color: $a-b;\n  color: $a_b;\n}\na {\n  @include foo($a_b: a);\n  @include foo($a-b: a);\n}\n",
     "a {\n  color: a;\n  color: a;\n  color: a;\n  color: a;\n}\n"
 );
+test!(
+    control_flow_in_content,
+    "@mixin foo {\n    @content;\n}\n\na {\n    @include foo {@if true {color: red;}}\n}\n",
+    "a {\n  color: red;\n}\n"
+);