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Explain all casts in detail

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This commit is contained in:
Oliver Scherer 2018-10-15 19:58:21 +02:00
parent 507381ed03
commit 34052047cf
1 changed files with 11 additions and 2 deletions
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13
src/librustc_mir/transform/qualify_min_const_fn.rs
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@ -163,9 +163,18 @@ fn check_rvalue(
_ => check_operand(tcx, mir, operand, span),
}
}
Rvalue::Cast(_, _, _) => Err((
Rvalue::Cast(CastKind::UnsafeFnPointer, _, _) |
Rvalue::Cast(CastKind::ReifyFnPointer, _, _) => Err((
span,
"only int casts are allowed in const fn".into(),
"function pointer casts are not allowed in const fn".into(),
)),
Rvalue::Cast(CastKind::ClosureFnPointer, _, _) => Err((
span,
"closures are not allowed in const fn".into(),
)),
Rvalue::Cast(CastKind::Unsize, _, _) => Err((
span,
"unsizing casts are not allowed in const fn".into(),
)),
// binops are fine on integers
Rvalue::BinaryOp(_, lhs, rhs) | Rvalue::CheckedBinaryOp(_, lhs, rhs) => {