| library; | 
 | // | 
 | // Problems in library: | 
 | // | 
 | // pkg/front_end/testcases/rasta/issue_000031.dart:8:3: Error: A prefix can't be used as an expression. | 
 | //   math..toString(); | 
 | //   ^^^^ | 
 | // | 
 | import self as self; | 
 | import "dart:core" as core; | 
 |  | 
 | import "dart:math" as math; | 
 |  | 
 | static method main() → dynamic { | 
 |   let final invalid-type #t1 = invalid-expression "pkg/front_end/testcases/rasta/issue_000031.dart:8:3: Error: A prefix can't be used as an expression. | 
 |   math..toString(); | 
 |   ^^^^" in block { | 
 |     #t1.{core::Object::toString}(){() → core::String}; | 
 |   } =>#t1; | 
 | } |