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Fix parser regressions of conditional expressions #75075

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merged 6 commits into from
Sep 24, 2024
Merged

Fix parser regressions of conditional expressions #75075

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222b836
Fix regression of parsing `with` expression in conditional expression
DoctorKrolic Sep 12, 2024
edb7723
Fix linq query parsing
DoctorKrolic Sep 12, 2024
4c36ed9
Merge branch 'dotnet:main' into with-parsing-regression
DoctorKrolic Sep 19, 2024
11ab036
More `await` tests
DoctorKrolic Sep 21, 2024
af05256
Add `global` test
DoctorKrolic Sep 21, 2024
af02bf2
Add `yield` tests
DoctorKrolic Sep 21, 2024
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8 changes: 7 additions & 1 deletion src/Compilers/CSharp/Portable/Parser/LanguageParser.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -7434,7 +7434,13 @@ bool canFollowNullableType()
if (this.CurrentToken.ContextualKind is SyntaxKind.AsyncKeyword or SyntaxKind.AwaitKeyword)
return false;

var nextTokenKind = PeekToken(1).Kind;
var nextToken = PeekToken(1);

// Cases like `x is Y ? someRecord with { } : ...`
if (nextToken.ContextualKind == SyntaxKind.WithKeyword)
return false;

var nextTokenKind = nextToken.Kind;

// These token either 100% end a pattern or start a new one:

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150 changes: 150 additions & 0 deletions src/Compilers/CSharp/Test/Syntax/Parsing/RecordParsing.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -2099,6 +2099,156 @@ public void WithParsing19()
EOF();
}

[Fact, WorkItem("https://github.com/dotnet/roslyn/issues/75074")]
public void WithParsingInConditionalExpression1()
{
var text = "x is X ? record with { } : record with { }";

UsingExpression(text);
N(SyntaxKind.ConditionalExpression);
{
N(SyntaxKind.IsExpression);
{
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "x");
}
N(SyntaxKind.IsKeyword);
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "X");
}
}
N(SyntaxKind.QuestionToken);
N(SyntaxKind.WithExpression);
{
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "record");
}
N(SyntaxKind.WithKeyword);
N(SyntaxKind.WithInitializerExpression);
{
N(SyntaxKind.OpenBraceToken);
N(SyntaxKind.CloseBraceToken);
}
}
N(SyntaxKind.ColonToken);
N(SyntaxKind.WithExpression);
{
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "record");
}
N(SyntaxKind.WithKeyword);
N(SyntaxKind.WithInitializerExpression);
{
N(SyntaxKind.OpenBraceToken);
N(SyntaxKind.CloseBraceToken);
}
}
}
EOF();
}

[Fact, WorkItem("https://github.com/dotnet/roslyn/issues/75074")]
public void WithParsingInConditionalExpression2()
{
var text = "x is X.Y ? record with { } : record with { }";

UsingExpression(text);
N(SyntaxKind.ConditionalExpression);
{
N(SyntaxKind.IsExpression);
{
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "x");
}
N(SyntaxKind.IsKeyword);
N(SyntaxKind.QualifiedName);
{
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "X");
}
N(SyntaxKind.DotToken);
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "Y");
}
}
}
N(SyntaxKind.QuestionToken);
N(SyntaxKind.WithExpression);
{
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "record");
}
N(SyntaxKind.WithKeyword);
N(SyntaxKind.WithInitializerExpression);
{
N(SyntaxKind.OpenBraceToken);
N(SyntaxKind.CloseBraceToken);
}
}
N(SyntaxKind.ColonToken);
N(SyntaxKind.WithExpression);
{
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "record");
}
N(SyntaxKind.WithKeyword);
N(SyntaxKind.WithInitializerExpression);
{
N(SyntaxKind.OpenBraceToken);
N(SyntaxKind.CloseBraceToken);
}
}
}
EOF();
}

[Fact, WorkItem("https://github.com/dotnet/roslyn/issues/75074")]
public void WithParsingInConditionalExpression_Incomplete()
{
var text = "x is X ? record with";

UsingExpression(text,
// (1,17): error CS1003: Syntax error, ':' expected
// x is X ? record with
Diagnostic(ErrorCode.ERR_SyntaxError, "with").WithArguments(":").WithLocation(1, 17));

N(SyntaxKind.ConditionalExpression);
{
N(SyntaxKind.IsExpression);
{
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "x");
}
N(SyntaxKind.IsKeyword);
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "X");
}
}
N(SyntaxKind.QuestionToken);
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "record");
}
M(SyntaxKind.ColonToken);
N(SyntaxKind.IdentifierName);
{
N(SyntaxKind.IdentifierToken, "with");
}
}
EOF();
}

[Fact]
public void ParameterListAndBaseListOnClass()
{
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