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chore(lib): remove error branch from LUT if it is unreachable #386

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merged 4 commits into from
Jun 2, 2024
Merged

chore(lib): remove error branch from LUT if it is unreachable #386

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9149056
remove error branch from LUT if it is unreachable
RustyYato Apr 8, 2024
0dfcf00
add codegen tests for LUT
RustyYato May 3, 2024
4896861
add explicit codegen tests
RustyYato May 6, 2024
d2e0ebf
Revert "add codegen tests for LUT"
RustyYato May 6, 2024
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195 changes: 195 additions & 0 deletions logos-cli/tests/data/no_error_lut/fmt_output.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,195 @@
#[derive()]
enum Token {
Newline,
AnyUnicode,
Any,
}
impl<'s> ::logos::Logos<'s> for Token {
type Error = ();
type Extras = ();
type Source = [u8];
fn lex(lex: &mut ::logos::Lexer<'s, Self>) {
use logos::internal::{CallbackResult, LexerInternal};
type Lexer<'s> = ::logos::Lexer<'s, Token>;
fn _end<'s>(lex: &mut Lexer<'s>) {
lex.end()
}
fn _error<'s>(lex: &mut Lexer<'s>) {
lex.bump_unchecked(1);
lex.error();
}
macro_rules ! _fast_loop { ($ lex : ident , $ test : ident , $ miss : expr) => { while let Some (arr) = $ lex . read :: < & [u8 ; 16] > () { if $ test (arr [0]) { if $ test (arr [1]) { if $ test (arr [2]) { if $ test (arr [3]) { if $ test (arr [4]) { if $ test (arr [5]) { if $ test (arr [6]) { if $ test (arr [7]) { if $ test (arr [8]) { if $ test (arr [9]) { if $ test (arr [10]) { if $ test (arr [11]) { if $ test (arr [12]) { if $ test (arr [13]) { if $ test (arr [14]) { if $ test (arr [15]) { $ lex . bump_unchecked (16) ; continue ; } $ lex . bump_unchecked (15) ; return $ miss ; } $ lex . bump_unchecked (14) ; return $ miss ; } $ lex . bump_unchecked (13) ; return $ miss ; } $ lex . bump_unchecked (12) ; return $ miss ; } $ lex . bump_unchecked (11) ; return $ miss ; } $ lex . bump_unchecked (10) ; return $ miss ; } $ lex . bump_unchecked (9) ; return $ miss ; } $ lex . bump_unchecked (8) ; return $ miss ; } $ lex . bump_unchecked (7) ; return $ miss ; } $ lex . bump_unchecked (6) ; return $ miss ; } $ lex . bump_unchecked (5) ; return $ miss ; } $ lex . bump_unchecked (4) ; return $ miss ; } $ lex . bump_unchecked (3) ; return $ miss ; } $ lex . bump_unchecked (2) ; return $ miss ; } $ lex . bump_unchecked (1) ; return $ miss ; } return $ miss ; } while $ lex . test ($ test) { $ lex . bump_unchecked (1) ; } $ miss } ; }
#[inline]
fn goto1_x<'s>(lex: &mut Lexer<'s>) {
lex.set(Ok(Token::Newline));
}
#[inline]
fn goto11_ctx11_x<'s>(lex: &mut Lexer<'s>) {
lex.set(Ok(Token::Any));
}
#[inline]
fn goto2_ctx11_x<'s>(lex: &mut Lexer<'s>) {
lex.set(Ok(Token::AnyUnicode));
}
#[inline]
fn goto16_ctx11_x<'s>(lex: &mut Lexer<'s>) {
match lex.read::<&[u8; 2usize]>() {
Some([128u8..=159u8, 128u8..=191u8]) => {
lex.bump_unchecked(2usize);
goto2_ctx11_x(lex)
}
_ => goto11_ctx11_x(lex),
}
}
#[inline]
fn goto17_ctx11_x<'s>(lex: &mut Lexer<'s>) {
match lex.read::<&[u8; 3usize]>() {
Some([144u8..=191u8, 128u8..=191u8, 128u8..=191u8]) => {
lex.bump_unchecked(3usize);
goto2_ctx11_x(lex)
}
_ => goto11_ctx11_x(lex),
}
}
#[inline]
fn goto2_x<'s>(lex: &mut Lexer<'s>) {
lex.set(Ok(Token::AnyUnicode));
}
#[inline]
fn goto13_ctx11_x<'s>(lex: &mut Lexer<'s>) {
match lex.read::<&[u8; 1usize]>() {
Some([128u8..=191u8]) => {
lex.bump_unchecked(1usize);
goto2_ctx11_x(lex)
}
_ => goto11_ctx11_x(lex),
}
}
#[inline]
fn goto18_ctx11_x<'s>(lex: &mut Lexer<'s>) {
match lex.read::<&[u8; 3usize]>() {
Some([128u8..=191u8, 128u8..=191u8, 128u8..=191u8]) => {
lex.bump_unchecked(3usize);
goto2_ctx11_x(lex)
}
_ => goto11_ctx11_x(lex),
}
}
#[inline]
fn goto15_ctx11_x<'s>(lex: &mut Lexer<'s>) {
match lex.read::<&[u8; 2usize]>() {
Some([128u8..=191u8, 128u8..=191u8]) => {
lex.bump_unchecked(2usize);
goto2_ctx11_x(lex)
}
_ => goto11_ctx11_x(lex),
}
}
#[inline]
fn goto14_ctx11_x<'s>(lex: &mut Lexer<'s>) {
match lex.read::<&[u8; 2usize]>() {
Some([160u8..=191u8, 128u8..=191u8]) => {
lex.bump_unchecked(2usize);
goto2_ctx11_x(lex)
}
_ => goto11_ctx11_x(lex),
}
}
#[inline]
fn goto19_ctx11_x<'s>(lex: &mut Lexer<'s>) {
match lex.read::<&[u8; 3usize]>() {
Some([128u8..=143u8, 128u8..=191u8, 128u8..=191u8]) => {
lex.bump_unchecked(3usize);
goto2_ctx11_x(lex)
}
_ => goto11_ctx11_x(lex),
}
}
#[inline]
fn goto11_x<'s>(lex: &mut Lexer<'s>) {
lex.set(Ok(Token::Any));
}
#[inline]
fn goto20<'s>(lex: &mut Lexer<'s>) {
enum Jump {
J1,
J16,
J17,
J2,
J13,
J18,
J15,
J14,
J19,
J11,
}
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const LUT: [Jump; 256] = {
use Jump::*;
[
J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J1, J2, J2, J2, J2, J2, J2, J2, J2, J2,
J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2,
J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2,
J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2,
J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2,
J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2, J2,
J2, J2, J2, J2, J2, J2, J2, J2, J11, J11, J11, J11, J11, J11, J11, J11, J11,
J11, J11, J11, J11, J11, J11, J11, J11, J11, J11, J11, J11, J11, J11, J11, J11,
J11, J11, J11, J11, J11, J11, J11, J11, J11, J11, J11, J11, J11, J11, J11, J11,
J11, J11, J11, J11, J11, J11, J11, J11, J11, J11, J11, J11, J11, J11, J11, J11,
J11, J11, J11, J11, J11, J11, J11, J11, J11, J13, J13, J13, J13, J13, J13, J13,
J13, J13, J13, J13, J13, J13, J13, J13, J13, J13, J13, J13, J13, J13, J13, J13,
J13, J13, J13, J13, J13, J13, J13, J14, J15, J15, J15, J15, J15, J15, J15, J15,
J15, J15, J15, J15, J16, J15, J15, J17, J18, J18, J18, J19, J11, J11, J11, J11,
J11, J11, J11, J11, J11, J11, J11,
]
};
let byte = match lex.read::<u8>() {
Some(byte) => byte,
None => return _end(lex),
};
match LUT[byte as usize] {
Jump::J1 => {
lex.bump_unchecked(1usize);
goto1_x(lex)
}
Jump::J16 => {
lex.bump_unchecked(1usize);
goto16_ctx11_x(lex)
}
Jump::J17 => {
lex.bump_unchecked(1usize);
goto17_ctx11_x(lex)
}
Jump::J2 => {
lex.bump_unchecked(1usize);
goto2_x(lex)
}
Jump::J13 => {
lex.bump_unchecked(1usize);
goto13_ctx11_x(lex)
}
Jump::J18 => {
lex.bump_unchecked(1usize);
goto18_ctx11_x(lex)
}
Jump::J15 => {
lex.bump_unchecked(1usize);
goto15_ctx11_x(lex)
}
Jump::J14 => {
lex.bump_unchecked(1usize);
goto14_ctx11_x(lex)
}
Jump::J19 => {
lex.bump_unchecked(1usize);
goto19_ctx11_x(lex)
}
Jump::J11 => {
lex.bump_unchecked(1usize);
goto11_x(lex)
}
}
}
goto20(lex)
}
}
10 changes: 10 additions & 0 deletions logos-cli/tests/data/no_error_lut/input.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,10 @@
#[derive(Logos)]
#[logos(source = [u8])]
enum Token {
#[token("\n")]
Newline,
#[regex(".")]
AnyUnicode,
#[regex(b".", priority = 0)]
Any,
}
1 change: 1 addition & 0 deletions logos-cli/tests/data/no_error_lut/output.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
# [derive ()] enum Token { Newline , AnyUnicode , Any , }impl < 's > :: logos :: Logos < 's > for Token { type Error = () ; type Extras = () ; type Source = [u8] ; fn lex (lex : & mut :: logos :: Lexer < 's , Self >) { use :: logos :: internal :: { LexerInternal , CallbackResult } ; type Lexer < 's > = :: logos :: Lexer < 's , Token > ; fn _end < 's > (lex : & mut Lexer < 's >) { lex . end () } fn _error < 's > (lex : & mut Lexer < 's >) { lex . bump_unchecked (1) ; lex . error () ; } macro_rules ! _fast_loop { ($ lex : ident , $ test : ident , $ miss : expr) => { while let Some (arr) = $ lex . read :: < & [u8 ; 16] > () { if $ test (arr [0]) { if $ test (arr [1]) { if $ test (arr [2]) { if $ test (arr [3]) { if $ test (arr [4]) { if $ test (arr [5]) { if $ test (arr [6]) { if $ test (arr [7]) { if $ test (arr [8]) { if $ test (arr [9]) { if $ test (arr [10]) { if $ test (arr [11]) { if $ test (arr [12]) { if $ test (arr [13]) { if $ test (arr [14]) { if $ test (arr [15]) { $ lex . bump_unchecked (16) ; continue ; } $ lex . bump_unchecked (15) ; return $ miss ; } $ lex . bump_unchecked (14) ; return $ miss ; } $ lex . bump_unchecked (13) ; return $ miss ; } $ lex . bump_unchecked (12) ; return $ miss ; } $ lex . bump_unchecked (11) ; return $ miss ; } $ lex . bump_unchecked (10) ; return $ miss ; } $ lex . bump_unchecked (9) ; return $ miss ; } $ lex . bump_unchecked (8) ; return $ miss ; } $ lex . bump_unchecked (7) ; return $ miss ; } $ lex . bump_unchecked (6) ; return $ miss ; } $ lex . bump_unchecked (5) ; return $ miss ; } $ lex . bump_unchecked (4) ; return $ miss ; } $ lex . bump_unchecked (3) ; return $ miss ; } $ lex . bump_unchecked (2) ; return $ miss ; } $ lex . bump_unchecked (1) ; return $ miss ; } return $ miss ; } while $ lex . test ($ test) { $ lex . bump_unchecked (1) ; } $ miss } ; } # [inline] fn goto1_x < 's > (lex : & mut Lexer < 's >) { lex . set (Ok (Token :: Newline)) ; } # [inline] fn goto11_ctx11_x < 's > (lex : & mut Lexer < 's >) { lex . set (Ok (Token :: Any)) ; } # [inline] fn goto2_ctx11_x < 's > (lex : & mut Lexer < 's >) { lex . set (Ok (Token :: AnyUnicode)) ; } # [inline] fn goto16_ctx11_x < 's > (lex : & mut Lexer < 's >) { match lex . read :: < & [u8 ; 2usize] > () { Some ([128u8 ..= 159u8 , 128u8 ..= 191u8]) => { lex . bump_unchecked (2usize) ; goto2_ctx11_x (lex) } , _ => goto11_ctx11_x (lex) , } } # [inline] fn goto17_ctx11_x < 's > (lex : & mut Lexer < 's >) { match lex . read :: < & [u8 ; 3usize] > () { Some ([144u8 ..= 191u8 , 128u8 ..= 191u8 , 128u8 ..= 191u8]) => { lex . bump_unchecked (3usize) ; goto2_ctx11_x (lex) } , _ => goto11_ctx11_x (lex) , } } # [inline] fn goto2_x < 's > (lex : & mut Lexer < 's >) { lex . set (Ok (Token :: AnyUnicode)) ; } # [inline] fn goto13_ctx11_x < 's > (lex : & mut Lexer < 's >) { match lex . read :: < & [u8 ; 1usize] > () { Some ([128u8 ..= 191u8]) => { lex . bump_unchecked (1usize) ; goto2_ctx11_x (lex) } , _ => goto11_ctx11_x (lex) , } } # [inline] fn goto18_ctx11_x < 's > (lex : & mut Lexer < 's >) { match lex . read :: < & [u8 ; 3usize] > () { Some ([128u8 ..= 191u8 , 128u8 ..= 191u8 , 128u8 ..= 191u8]) => { lex . bump_unchecked (3usize) ; goto2_ctx11_x (lex) } , _ => goto11_ctx11_x (lex) , } } # [inline] fn goto15_ctx11_x < 's > (lex : & mut Lexer < 's >) { match lex . read :: < & [u8 ; 2usize] > () { Some ([128u8 ..= 191u8 , 128u8 ..= 191u8]) => { lex . bump_unchecked (2usize) ; goto2_ctx11_x (lex) } , _ => goto11_ctx11_x (lex) , } } # [inline] fn goto14_ctx11_x < 's > (lex : & mut Lexer < 's >) { match lex . read :: < & [u8 ; 2usize] > () { Some ([160u8 ..= 191u8 , 128u8 ..= 191u8]) => { lex . bump_unchecked (2usize) ; goto2_ctx11_x (lex) } , _ => goto11_ctx11_x (lex) , } } # [inline] fn goto19_ctx11_x < 's > (lex : & mut Lexer < 's >) { match lex . read :: < & [u8 ; 3usize] > () { Some ([128u8 ..= 143u8 , 128u8 ..= 191u8 , 128u8 ..= 191u8]) => { lex . bump_unchecked (3usize) ; goto2_ctx11_x (lex) } , _ => goto11_ctx11_x (lex) , } } # [inline] fn goto11_x < 's > (lex : & mut Lexer < 's >) { lex . set (Ok (Token :: Any)) ; } # [inline] fn goto20 < 's > (lex : & mut Lexer < 's >) { enum Jump { J1 , J16 , J17 , J2 , J13 , J18 , J15 , J14 , J19 , J11 , } const LUT : [Jump ; 256] = { use Jump :: * ; [J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J1 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J2 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J13 , J14 , J15 , J15 , J15 , J15 , J15 , J15 , J15 , J15 , J15 , J15 , J15 , J15 , J16 , J15 , J15 , J17 , J18 , J18 , J18 , J19 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11 , J11] } ; let byte = match lex . read :: < u8 > () { Some (byte) => byte , None => return _end (lex) , } ; match LUT [byte as usize] { Jump :: J1 => { lex . bump_unchecked (1usize) ; goto1_x (lex) } , Jump :: J16 => { lex . bump_unchecked (1usize) ; goto16_ctx11_x (lex) } , Jump :: J17 => { lex . bump_unchecked (1usize) ; goto17_ctx11_x (lex) } , Jump :: J2 => { lex . bump_unchecked (1usize) ; goto2_x (lex) } , Jump :: J13 => { lex . bump_unchecked (1usize) ; goto13_ctx11_x (lex) } , Jump :: J18 => { lex . bump_unchecked (1usize) ; goto18_ctx11_x (lex) } , Jump :: J15 => { lex . bump_unchecked (1usize) ; goto15_ctx11_x (lex) } , Jump :: J14 => { lex . bump_unchecked (1usize) ; goto14_ctx11_x (lex) } , Jump :: J19 => { lex . bump_unchecked (1usize) ; goto19_ctx11_x (lex) } , Jump :: J11 => { lex . bump_unchecked (1usize) ; goto11_x (lex) } , } } goto20 (lex) } }
0 logos-cli/tests/data/fmt_output.rs → logos-cli/tests/data/simple/fmt_output.rs
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0 logos-cli/tests/data/input.rs → logos-cli/tests/data/simple/input.rs
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0 logos-cli/tests/data/output.rs → logos-cli/tests/data/simple/output.rs
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111 changes: 73 additions & 38 deletions logos-cli/tests/tests.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,47 +4,80 @@ use assert_cmd::Command;
use assert_fs::{assert::PathAssert, fixture::FileWriteStr, NamedTempFile};
use predicates::prelude::*;

const INPUT_FILE: &str = concat!(env!("CARGO_MANIFEST_DIR"), "/tests/data/input.rs");
const OUTPUT_FILE: &str = concat!(env!("CARGO_MANIFEST_DIR"), "/tests/data/output.rs");
const FMT_OUTPUT_FILE: &str = concat!(env!("CARGO_MANIFEST_DIR"), "/tests/data/fmt_output.rs");
struct Fixture {
input: &'static str,
output: &'static str,
fmt_output: &'static str,
}

const FIXTURES: &[Fixture] = &[
Fixture {
input: concat!(env!("CARGO_MANIFEST_DIR"), "/tests/data/simple/input.rs"),
output: concat!(env!("CARGO_MANIFEST_DIR"), "/tests/data/simple/output.rs"),
fmt_output: concat!(
env!("CARGO_MANIFEST_DIR"),
"/tests/data/simple/fmt_output.rs"
),
},
Fixture {
input: concat!(
env!("CARGO_MANIFEST_DIR"),
"/tests/data/no_error_lut/input.rs"
),
output: concat!(
env!("CARGO_MANIFEST_DIR"),
"/tests/data/no_error_lut/output.rs"
),
fmt_output: concat!(
env!("CARGO_MANIFEST_DIR"),
"/tests/data/no_error_lut/fmt_output.rs"
),
},
];

#[test]
fn test_codegen() {
let tempfile = NamedTempFile::new("output.gen.rs").unwrap();
for fixture in FIXTURES.iter() {
let tempfile = NamedTempFile::new("output.gen.rs").unwrap();

let mut cmd = Command::cargo_bin("logos-cli").unwrap();
cmd.arg(INPUT_FILE)
.arg("--output")
.arg(tempfile.path())
.assert()
.success();
let mut cmd = Command::cargo_bin("logos-cli").unwrap();
cmd.arg(fixture.input)
.arg("--output")
.arg(tempfile.path())
.assert()
.success();

tempfile.assert(normalize_newlines(OUTPUT_FILE));
tempfile.assert(normalize_newlines(fixture.output));
}
}

#[test]
fn test_codegen_check() {
Command::cargo_bin("logos-cli")
.unwrap()
.arg(INPUT_FILE)
.arg("--check")
.arg("--output")
.arg(OUTPUT_FILE)
.assert()
.success();
for fixture in FIXTURES.iter() {
Command::cargo_bin("logos-cli")
.unwrap()
.arg(fixture.input)
.arg("--check")
.arg("--output")
.arg(fixture.output)
.assert()
.success();
}
}

#[test]
fn test_codegen_check_format() {
Command::cargo_bin("logos-cli")
.unwrap()
.arg(INPUT_FILE)
.arg("--format")
.arg("--check")
.arg("--output")
.arg(FMT_OUTPUT_FILE)
.assert()
.success();
for fixture in FIXTURES.iter() {
Command::cargo_bin("logos-cli")
.unwrap()
.arg(fixture.input)
.arg("--format")
.arg("--check")
.arg("--output")
.arg(fixture.fmt_output)
.assert()
.success();
}
}

#[test]
Expand All @@ -55,7 +88,7 @@ fn test_codegen_fail_check() {

Command::cargo_bin("logos-cli")
.unwrap()
.arg(INPUT_FILE)
.arg(FIXTURES[0].input)
.arg("--check")
.arg("--output")
.arg(tempfile.path())
Expand All @@ -65,17 +98,19 @@ fn test_codegen_fail_check() {

#[test]
fn test_codegen_format() {
let tempfile = NamedTempFile::new("output.gen.rs").unwrap();
for fixture in FIXTURES {
let tempfile = NamedTempFile::new("output.gen.rs").unwrap();

let mut cmd = Command::cargo_bin("logos-cli").unwrap();
cmd.arg(INPUT_FILE)
.arg("--format")
.arg("--output")
.arg(tempfile.path())
.assert()
.success();
let mut cmd = Command::cargo_bin("logos-cli").unwrap();
cmd.arg(fixture.input)
.arg("--format")
.arg("--output")
.arg(tempfile.path())
.assert()
.success();

tempfile.assert(normalize_newlines(FMT_OUTPUT_FILE));
tempfile.assert(normalize_newlines(fixture.fmt_output));
}
}

fn normalize_newlines(s: impl AsRef<Path>) -> impl Predicate<str> {
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