Fix tests

Author: pkch

test-data/unit/check-classes.test

@@ -714,7 +714,7 @@ A()
 class A: pass
 class A: pass
 [out]
-main:4: error: Name 'A' already defined in line 3
+main:4: error: Name 'A' already defined on line 3
 
 [case testDocstringInClass]
 import typing

test-data/unit/check-functions.test

@@ -1212,7 +1212,7 @@ from typing import Any
 x = None # type: Any
 if x:
     def f(): pass
-def f(): pass # E: Name 'f' already defined in line 4
+def f(): pass # E: Name 'f' already defined on line 4
 
 [case testIncompatibleConditionalFunctionDefinition]
 from typing import Any
@@ -1835,7 +1835,7 @@ f = g # E: Incompatible types in assignment (expression has type Callable[[Any,
 
 [case testRedefineFunction2]
 def f() -> None: pass
-def f() -> None: pass # E: Name 'f' already defined in line 1
+def f() -> None: pass # E: Name 'f' already defined on line 1
 
 
 -- Special cases

test-data/unit/check-overloading.test

@@ -1106,7 +1106,7 @@ def f(a: int) -> None: pass
 def f(a: str) -> None: pass
 [out]
 tmp/foo.pyi:2: error: Single overload definition, multiple required
-tmp/foo.pyi:5: error: Name 'f' already defined in line 2
+tmp/foo.pyi:5: error: Name 'f' already defined on line 2
 
 [case testOverloadTuple]
 from foo import *

test-data/unit/semanal-errors.test

@@ -165,16 +165,16 @@ import typing
 class A: pass
 class A: pass
 [out]
-main:3: error: Name 'A' already defined in line 2
+main:3: error: Name 'A' already defined on line 2
 
 [case testMultipleMixedDefinitions]
 import typing
 x = 1
 def x(): pass
 class x: pass
 [out]
-main:3: error: Name 'x' already defined in line 2
-main:4: error: Name 'x' already defined in line 2
+main:3: error: Name 'x' already defined on line 2
+main:4: error: Name 'x' already defined on line 2
 
 [case testNameNotImported]
 import typing
@@ -1037,13 +1037,13 @@ t = 1 # E: Invalid assignment target
 [case testRedefineTypevar2]
 from typing import TypeVar
 t = TypeVar('t')
-def t(): pass # E: Name 't' already defined in line 2
+def t(): pass # E: Name 't' already defined on line 2
 [out]
 
 [case testRedefineTypevar3]
 from typing import TypeVar
 t = TypeVar('t')
-class t: pass # E: Name 't' already defined in line 2
+class t: pass # E: Name 't' already defined on line 2
 [out]
 
 [case testRedefineTypevar4]