Paul Berry
c381425bd3
Expressions can also occur in patterns, either after an equality or relational operator (e.g. `== e`), or after `const` (though what's allowed after `const` is heavily restricted). We need to make sure that the expression parser doesn't greedily treat `=>` as introducing a function expression when parsing these constructs inside a switch expression. But it's ok to allow function expressions inside list patterns, map patterns, parenthesized patterns, and in the argument part of object patterns. (These will be rejected by a later stage of analysis because expressions inside of patterns must be const, and a function expression can't be const. But the parser should still accept them so that we can give useful error messages). Fixes #50591. Bug: https://github.com/dart-lang/sdk/issues/50591 Change-Id: I828555782f5bc8cb8aae8a3948849b7a75bdec57 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/273286 Reviewed-by: Jens Johansen <jensj@google.com> Commit-Queue: Paul Berry <paulberry@google.com>
49 lines
1.9 KiB
Plaintext
49 lines
1.9 KiB
Plaintext
beginCompilationUnit(f)
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beginMetadataStar(f)
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endMetadataStar(0)
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beginTopLevelMember(f)
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beginTopLevelMethod(, null, null)
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handleNoType()
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handleIdentifier(f, topLevelFunctionDeclaration)
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handleNoTypeVariables(()
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beginFormalParameters((, MemberKind.TopLevelMethod)
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beginMetadataStar(x)
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endMetadataStar(0)
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beginFormalParameter(x, MemberKind.TopLevelMethod, null, null, null)
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handleNoType(()
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handleIdentifier(x, formalParameterDeclaration)
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handleFormalParameterWithoutValue())
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endFormalParameter(null, null, null, x, null, null, FormalParameterKind.requiredPositional, MemberKind.TopLevelMethod)
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endFormalParameters(1, (, ), MemberKind.TopLevelMethod)
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handleAsyncModifier(null, null)
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beginSwitchExpression(switch)
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handleIdentifier(x, expression)
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handleNoTypeArguments())
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handleNoArguments())
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handleSend(x, ))
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handleParenthesizedCondition((, null, null)
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beginSwitchExpressionBlock({)
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beginSwitchExpressionCase()
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handleNoTypeArguments({)
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beginLiteralString('x')
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endLiteralString(0, :)
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handleNoTypeVariables(()
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beginFunctionExpression(()
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beginFormalParameters((, MemberKind.Local)
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endFormalParameters(0, (, ), MemberKind.Local)
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handleAsyncModifier(null, null)
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handleLiteralInt(0)
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handleExpressionFunctionBody(=>, null)
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endFunctionExpression((, })
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handleRelationalPattern(==)
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handleMapPatternEntry(:, })
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handleMapPattern(1, {, })
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handleLiteralInt(0)
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endSwitchExpressionCase(null, =>, 0)
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endSwitchExpressionBlock(1, {, })
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endSwitchExpression(switch, })
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handleExpressionFunctionBody(=>, ;)
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endTopLevelMethod(f, null, ;)
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endTopLevelDeclaration()
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endCompilationUnit(1, )
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