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---
source: crates/ruff_python_parser/src/lexer.rs
expression: lex_source(source)
---
## Tokens
```
[
(
FStringStart,
0..2,
TokenFlags(
F_STRING,
),
),
(
InterpolatedStringMiddle(
"\\",
),
2..3,
TokenFlags(
F_STRING,
),
),
(
Lbrace,
3..4,
),
(
Name(
Name("foo"),
),
4..7,
),
(
Rbrace,
7..8,
),
(
FStringEnd,
8..9,
TokenFlags(
F_STRING,
),
),
(
FStringStart,
10..12,
TokenFlags(
F_STRING,
),
),
(
InterpolatedStringMiddle(
"\\\\",
),
12..14,
TokenFlags(
F_STRING,
),
),
(
Lbrace,
14..15,
),
(
Name(
Name("foo"),
),
15..18,
),
(
Rbrace,
18..19,
),
(
FStringEnd,
19..20,
TokenFlags(
F_STRING,
),
),
(
FStringStart,
21..23,
TokenFlags(
F_STRING,
),
),
(
InterpolatedStringMiddle(
"\\{foo}",
),
23..31,
TokenFlags(
F_STRING,
),
),
(
FStringEnd,
31..32,
TokenFlags(
F_STRING,
),
),
(
FStringStart,
33..35,
TokenFlags(
F_STRING,
),
),
(
InterpolatedStringMiddle(
"\\\\{foo}",
),
35..44,
TokenFlags(
F_STRING,
),
),
(
FStringEnd,
44..45,
TokenFlags(
F_STRING,
),
),
(
Newline,
45..45,
),
]
```