Fix line number for decorator issues (#18392)

Fixes #18391

Author: hauntsaninja

mypy/checker.py

@@ -5117,7 +5117,7 @@ def visit_decorator_inner(self, e: Decorator, allow_empty: bool = False) -> None
                     self.fail(message_registry.MULTIPLE_OVERLOADS_REQUIRED, e)
                 continue
             dec = self.expr_checker.accept(d)
-            temp = self.temp_node(sig, context=e)
+            temp = self.temp_node(sig, context=d)
             fullname = None
             if isinstance(d, RefExpr):
                 fullname = d.fullname or None

test-data/unit/check-functions.test

@@ -916,10 +916,19 @@ f(None) # E: Too many arguments for "f"
 from typing import Any, Callable
 def dec1(f: Callable[[Any], None]) -> Callable[[], None]: pass
 def dec2(f: Callable[[Any, Any], None]) -> Callable[[Any], None]: pass
-@dec1 # E: Argument 1 to "dec2" has incompatible type "Callable[[Any], Any]"; expected "Callable[[Any, Any], None]"
-@dec2
+@dec1
+@dec2  # E: Argument 1 to "dec2" has incompatible type "Callable[[Any], Any]"; expected "Callable[[Any, Any], None]"
 def f(x): pass
 
+def faulty(c: Callable[[int], None]) -> Callable[[tuple[int, int]], None]:
+    return lambda x: None
+
+@faulty  # E: Argument 1 to "faulty" has incompatible type "Callable[[Tuple[int, int]], None]"; expected "Callable[[int], None]"
+@faulty  # E: Argument 1 to "faulty" has incompatible type "Callable[[str], None]"; expected "Callable[[int], None]"
+def g(x: str) -> None:
+    return None
+[builtins fixtures/tuple.pyi]
+
 [case testInvalidDecorator2]
 from typing import Any, Callable
 def dec1(f: Callable[[Any, Any], None]) -> Callable[[], None]: pass