treewide: automatic rewriting of all comment-style type annotations

Performed using https://github.com/ilevkivskyi/com2ann

This has no actual effect on the codebase as type checkers (still)
support both and negligible effect on runtime performance since
__future__ annotations ameliorates that. Technically, the bytecode would
be bigger for non function-local annotations, of which we have many
either way.

So if it doesn't really matter, why do a large-scale refactor? Simple:
because people keep wanting to, but it's getting nickle-and-dimed. If
we're going to do this we might as well do it consistently in one shot,
using tooling that guarantees repeatability and correctness.

Repeat with:

```
com2ann mesonbuild/
```

1 files changed, 2 insertions, 2 deletions

diff --git a/mesonbuild/mparser.py b/mesonbuild/mparser.py
index d4ddff929..fb4e43367 100644
--- a/mesonbuild/mparser.py
+++ b/mesonbuild/mparser.py
@@ -163,7 +163,7 @@ class Lexer:
         col = 0
         while loc < len(self.code):
             matched = False
-            value = None  # type: T.Union[str, bool, int]
+            value: T.Union[str, bool, int] = None
             for (tid, reg) in self.token_specification:
                 mo = reg.match(self.code, loc)
                 if mo:
@@ -610,7 +610,7 @@ class Parser:
     def __init__(self, code: str, filename: str):
         self.lexer = Lexer(code)
         self.stream = self.lexer.lex(filename)
-        self.current = Token('eof', '', 0, 0, 0, (0, 0), None)  # type: Token
+        self.current: Token = Token('eof', '', 0, 0, 0, (0, 0), None)
         self.getsym()
         self.in_ternary = False