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45a69154bd
Reimplement 'switch' parsing for our new AST representation, where cases contain patterns and 'where' guards, case blocks can have multiple cases, and 'default' is constrained to being the lone label of the last block if present. No type-checking or parsing of actual pattern productions yet. Swift SVN r5834
88 lines
1.7 KiB
Swift
88 lines
1.7 KiB
Swift
// RUN: %swift -dump-parse -verify %s
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var x:Int
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switch x {}
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switch x {
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case 0:
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break
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// Multiple patterns per case
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case 1, 2, 3:
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continue
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// Multiple cases per case block
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case 4:
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case 5:
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fallthrough
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// 'where' guard
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case 6..12 where x % 2 == 0:
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x = 1
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x = 2
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x = 3
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default:
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x = 1
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}
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switch x {
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x = 1 // expected-error{{all statements inside a switch must be covered by a 'case' or 'default'}}
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default:
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fallthrough
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case 0: // expected-error{{additional 'case' blocks cannot appear after the 'default' block of a 'switch'}}
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fallthrough
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case 1:
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fallthrough
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}
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switch x {
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default:
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fallthrough
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default: // expected-error{{additional 'case' blocks cannot appear after the 'default' block of a 'switch'}}
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fallthrough
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}
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switch x {
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x = 1 // expected-error{{all statements inside a switch must be covered by a 'case' or 'default'}}
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}
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switch x {
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x = 1 // expected-error{{all statements inside a switch must be covered by a 'case' or 'default'}}
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x = 2
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}
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switch x {
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default:
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case 0: // expected-error{{'default' cannot appear with other 'case' or 'default' labels over the same block}}
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fallthrough
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}
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switch x {
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default:
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default: // expected-error{{'default' cannot appear with other 'case' or 'default' labels over the same block}}
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fallthrough
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}
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switch x {
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case 0:
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default: // expected-error{{'default' cannot appear with other 'case' or 'default' labels over the same block}}
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fallthrough
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}
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switch x {
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default where x == 0: // expected-error{{'default' cannot be used with a 'where' guard expression}}
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fallthrough
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}
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switch x {
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case 0:
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}
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switch x {
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case 0:
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case 1:
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}
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case 0: // expected-error{{'case' can only appear inside a 'switch' statement}}
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var y = 0
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default: // expected-error{{'default' can only appear inside a 'switch' statement}}
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var z = 1
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