Update starred expression error inline with Python

mypy/semanal.py

@@ -4997,7 +4997,7 @@ def visit_dict_expr(self, expr: DictExpr) -> None:
 
     def visit_star_expr(self, expr: StarExpr) -> None:
         if not expr.valid:
-            self.fail("Can use starred expression only as assignment target", expr, blocker=True)
+            self.fail("can't use starred expression here", expr, blocker=True)
         else:
             expr.expr.accept(self)
 

test-data/unit/check-statements.test

@@ -2232,7 +2232,7 @@ def foo(x: int) -> Union[Generator[A, None, None], Generator[B, None, None]]:
     yield x  # E: Incompatible types in "yield" (actual type "int", expected type "Union[A, B]")
 
 [case testNoCrashOnStarRightHandSide]
-x = *(1, 2, 3)  # E: Can use starred expression only as assignment target
+x = *(1, 2, 3)  # E: can't use starred expression here
 [builtins fixtures/tuple.pyi]
 
 

test-data/unit/check-tuples.test

@@ -1118,7 +1118,7 @@ a = (0, *b, '')
 [builtins fixtures/tuple.pyi]
 
 [case testUnpackSyntaxError]
-*foo  # E: Can use starred expression only as assignment target
+*foo  # E: can't use starred expression here
 [builtins fixtures/tuple.pyi]
 
 [case testUnpackBases]

test-data/unit/semanal-errors.test

@@ -480,13 +480,13 @@ c = 1
 d = 1
 a = *b
 [out]
-main:4: error: Can use starred expression only as assignment target
+main:4: error: can't use starred expression here
 
 [case testStarExpressionInExp]
 a = 1
 *a + 1
 [out]
-main:2: error: Can use starred expression only as assignment target
+main:2: error: can't use starred expression here
 
 [case testInvalidDel1]
 x = 1