5b7d56f6f7
This PR adds support for `if-let` clauses, as proposed in bytecodealliance/rfcs#21. These clauses augment the left-hand side (pattern-matching phase) of rules in the ISLE instruction-selection DSL with sub-patterns matching on sub-expressions. The ability to list additional match operations to perform, out-of-line from the original toplevel pattern, greatly simplifies some idioms. See the RFC for more details and examples of use.
22 lines
385 B
Rust
22 lines
385 B
Rust
mod borrows;
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#[derive(Clone)]
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pub enum A {
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B { x: u32, y: u32 },
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}
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struct Context(A);
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impl borrows::Context for Context {
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fn get_a(&mut self, _: u32) -> Option<A> {
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Some(self.0.clone())
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}
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fn u32_pure(&mut self, value: u32) -> Option<u32> {
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Some(value + 1)
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}
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}
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fn main() {
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borrows::constructor_entry(&mut Context(A::B { x: 1, y: 2 }), 42);
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}
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