333388fd3c
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.
51 lines
1.8 KiB
Plaintext
51 lines
1.8 KiB
Plaintext
error: expected expression, found `let` statement
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--> $DIR/invalid-let-in-a-valid-let-context.rs:8:19
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LL | let _ = &&let Some(x) = Some(42);
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| ^^^
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error: expected expression, found `let` statement
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--> $DIR/invalid-let-in-a-valid-let-context.rs:13:47
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LL | if let Some(elem) = _opt && [1, 2, 3][let _ = &&let Some(x) = Some(42)] = 1 {
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| ^^^
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error: expected expression, found `let` statement
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--> $DIR/invalid-let-in-a-valid-let-context.rs:13:57
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LL | if let Some(elem) = _opt && [1, 2, 3][let _ = &&let Some(x) = Some(42)] = 1 {
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| ^^^
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error: expected expression, found `let` statement
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--> $DIR/invalid-let-in-a-valid-let-context.rs:13:12
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LL | if let Some(elem) = _opt && [1, 2, 3][let _ = &&let Some(x) = Some(42)] = 1 {
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| ^^^^^^^^^^^^^^^^^^^^^
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error: expected expression, found `let` statement
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--> $DIR/invalid-let-in-a-valid-let-context.rs:24:23
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LL | [1, 2, 3][let _ = ()];
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| ^^^
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error: expected expression, found `let` statement
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--> $DIR/invalid-let-in-a-valid-let-context.rs:33:47
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LL | if let Some(elem) = _opt && [1, 2, 3][let _ = ()] = 1 {
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| ^^^
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error: expected expression, found `let` statement
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--> $DIR/invalid-let-in-a-valid-let-context.rs:33:12
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LL | if let Some(elem) = _opt && [1, 2, 3][let _ = ()] = 1 {
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| ^^^^^^^^^^^^^^^^^^^^^
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error: expected expression, found `let` statement
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--> $DIR/invalid-let-in-a-valid-let-context.rs:42:21
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LL | let x = let y = 1;
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| ^^^
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error: aborting due to 8 previous errors
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