Change visitLoop to handleLoop that takes closures as arguments.

tests/co19/co19-leg.status

Index: tests/co19/co19-leg.status
diff --git a/tests/co19/co19-leg.status b/tests/co19/co19-leg.status
index e632c2dae971073b30a96aaefab227d6f7769dd1..1d648b0b8d2034824a9f8e6d53113b064113cf8b 100644
--- a/tests/co19/co19-leg.status
+++ b/tests/co19/co19-leg.status
@@ -153,7 +153,6 @@ Language/10_Expressions/27_Assignable_Expressions_A05_t01: Fail # compiler cance
 Language/10_Expressions/28_Identifier_Reference_A02_t01: Fail # compiler cancelled: unexpected token ';'
 Language/11_Statements/13_Continue_A02_t12: Fail # compiler cancelled: cannot resolve label L
 Language/11_Statements/13_Continue_A02_t13: Fail # compiler cancelled: cannot resolve label L
-Language/11_Statements/13_Continue_A03_t03: Fail # compiler cancelled: internal error: fall-through not implemented
 Language/11_Statements/13_Continue_A03_t05: Fail # compiler cancelled: internal error: fall-through not implemented
 Language/13_Types/2_Dynamic_Type_System_A02_t01: Fail # compiler cancelled: cannot resolve type MalformedType
 Language/13_Types/4_Interface_Types_A05_t04: Fail # compiler cancelled: cannot resolve type T
@@ -184,10 +183,6 @@ Language/11_Statements/09_Try_A05_t03: Fail # Expect.isTrue(false) fails.
 Language/11_Statements/11_Labels_A03_t04: Fail # continue not implemented
 Language/11_Statements/12_Break_A03_t09: Fail # Expect.listEquals(at index 3, expected: <4>, actual: <2>) fails
 Language/11_Statements/13_Continue_A03_t01: Fail # Expect.fail('This code shouldn't be executed')
-Language/11_Statements/13_Continue_A03_t02: Fail # continue not implemented
-Language/11_Statements/13_Continue_A03_t04: Fail # Expect.fail('This code shouldn't be executed')
-Language/11_Statements/13_Continue_A03_t06: Fail # continue not implemented
-Language/11_Statements/13_Continue_A03_t07: Fail # continue not implemented
 Language/11_Statements/14_Throw_A03_t02: Fail # Expect.isTrue(false) fails.
 Language/11_Statements/14_Throw_A03_t03: Fail # Expect.isTrue(false) fails.
 Language/13_Types/3_Type_Declarations/1_Typedef_A02_t01: Fail # Expect.isTrue(false) fails.
@@ -437,7 +432,7 @@ Language/08_Interfaces/Interfaces_A02_t02: Fail, OK # @compile-error
 Language/08_Interfaces/Interfaces_A02_t03: Fail, OK # @compile-error
 Language/08_Interfaces/Interfaces_A02_t04: Fail, OK # @compile-error
 Language/08_Interfaces/Interfaces_A02_t05: Fail, OK # @compile-error
-Language/10_Expressions/01_Constants_A15_t01.dart: Fail, OK # Assumes interpolations can't be constant.
+Language/10_Expressions/01_Constants_A15_t01: Fail, OK # Assumes interpolations can't be constant.
 Language/10_Expressions/01_Constants_A15_t03: Fail, OK # 'const' keyword is not verified in literal maps.
 Language/10_Expressions/01_Constants_A15_t34: Fail, OK # @compile-error
 Language/10_Expressions/02_Null_A04_t01: Fail, OK # @compile-error