diff --git a/src/pins25/phase/LexAn.java b/src/pins25/phase/LexAn.java
index 888f692..c85c711 100644
--- a/src/pins25/phase/LexAn.java
+++ b/src/pins25/phase/LexAn.java
@@ -247,8 +247,37 @@ public class LexAn implements AutoCloseable {
                     return;
                 }
 
-                while (buffChar != '\n' && buffChar != -1) {
+                nextChar();
+                if (buffChar == '{') {
+                    int depth = 1;
+
                     nextChar();
+                    while (depth > 0) {
+                        switch (buffChar) {
+                            case '}':
+                                nextChar();
+                                if (buffChar != '/') continue;
+                                nextChar();
+                                if (buffChar != '/') continue;
+                                depth--;
+                                break;
+                            case '/':
+                                nextChar();
+                                if (buffChar != '/') continue;
+                                nextChar();
+                                if (buffChar != '{') continue;
+                                depth++;
+                                break;
+                            case -1:
+                                throw new Report.Error(currentLocation(), "Unterminated multiline comment");
+                            default:
+                                nextChar();
+                        }
+                    }
+                } else {
+                    while (buffChar != '\n' && buffChar != -1) {
+                        nextChar();
+                    }
                 }
 
                 nextToken();