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Parse patterns as top-level expression productions, for name binding to validate and convert into proper patterns later. If the type-checker sees an UnboundPattern production survive name binding (currently always), then raise a helpful "patterns don't belong here" error. Swift SVN r5842
13 lines
557 B
Swift
13 lines
557 B
Swift
// RUN: %swift -parse -verify %s
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// Raise an error if pattern productions are used in expressions.
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var a = _ // expected-error{{'_' pattern cannot appear in an expression}}
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var b = var a // expected-error{{'var' binding pattern cannot appear in an expression}}
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var c = is Int // expected-error{{prefix 'is' pattern cannot appear in an expression}}
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// TODO: Bad recovery in these cases. Although patterns are never valid
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// expr-unary productions, it would be good to parse them anyway for recovery.
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//var d = _ + 1
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//var e = 2 + var y
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//var e = var y + 2
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