dimgigov
f619316470
Lower match to if-else for literals, ranges, enum tags, and wildcards. Fix bootstrap literal arms that always matched; port real arm AST/parser and Lcx_LowerMatch to selfhost with last-expression return. Expand pattern_matching example and add parse/use-after-move/double-mut golden diagnostics. Selfhost-loop remains binary-identical.
66 lines
1.2 KiB
Plaintext
66 lines
1.2 KiB
Plaintext
// Pattern Matching — enum tags, literals, ranges, wildcard
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import Std::Io::{PrintLine, PrintInt};
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enum Option {
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Some(int),
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None
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}
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func GetValue(opt: Option) -> int {
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match opt {
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Option::Some(value) => opt.data.Some_0,
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Option::None => 0
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}
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}
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func Classify(n: int) -> int {
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// literal arms + exclusive range + inclusive range + wildcard
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match n {
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0 => 100,
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1 => 101,
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2..5 => 200,
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6..=10 => 300,
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_ => -1
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}
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}
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func ColorName(c: int) -> String {
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match c {
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1 => "red",
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2 => "green",
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3 => "blue",
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_ => "unknown"
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}
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}
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func Main() -> int {
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let opt1: Option = Option { tag: Option_Some };
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opt1.data.Some_0 = 42;
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let opt2: Option = Option { tag: Option_None };
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PrintLine("opt1 value: ");
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PrintInt(GetValue(opt1));
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PrintLine("");
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PrintLine("opt2 value: ");
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PrintInt(GetValue(opt2));
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PrintLine("");
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PrintLine("classify:");
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PrintInt(Classify(0));
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PrintLine("");
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PrintInt(Classify(3));
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PrintLine("");
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PrintInt(Classify(8));
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PrintLine("");
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PrintInt(Classify(99));
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PrintLine("");
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PrintLine("color:");
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PrintLine(ColorName(2));
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return 0;
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}
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