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There was an incomplete version of the check in parsing and a second version in AST validation. This meant that some, but not all, invalid uses were allowed inside macros/disabled cfgs. It also means that later passes have a hard time knowing when the let expression is in a valid location, sometimes causing ICEs. - Add a field to ExprKind::Let in AST/HIR to mark whether it's in a valid location. - Suppress later errors and MIR construction for invalid let expressions.
55 lines
1.4 KiB
Rust
55 lines
1.4 KiB
Rust
#![feature(let_chains)]
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fn main() {
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let opt = Some(1i32);
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let Some(n) = opt else {
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return;
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};
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let Some(n) = opt && n == 1 else {
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//~^ ERROR a `&&` expression cannot be directly assigned in `let...else`
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//~| ERROR mismatched types
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//~| ERROR mismatched types
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return;
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};
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let Some(n) = opt && let another = n else {
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//~^ ERROR a `&&` expression cannot be directly assigned in `let...else`
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//~| ERROR mismatched types
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//~| ERROR mismatched types
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//~| ERROR expected expression, found `let` statement
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return;
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};
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if let Some(n) = opt else {
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//~^ ERROR this `if` expression is missing a block after the condition
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return;
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};
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if let Some(n) = opt && n == 1 else {
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//~^ ERROR this `if` expression is missing a block after the condition
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return;
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};
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if let Some(n) = opt && let another = n else {
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//~^ ERROR this `if` expression is missing a block after the condition
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return;
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};
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{
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while let Some(n) = opt else {
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//~^ ERROR expected `{`, found keyword `else`
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return;
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};
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}
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{
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while let Some(n) = opt && n == 1 else {
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//~^ ERROR expected `{`, found keyword `else`
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return;
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};
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}
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{
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while let Some(n) = opt && let another = n else {
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//~^ ERROR expected `{`, found keyword `else`
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return;
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};
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}
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}
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