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Revert let_chains stabilization

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This reverts commit 3266460749.

This is the revert against master, the beta revert was already done in #100538.
This commit is contained in:
Nilstrieb 2022-08-20 20:40:08 +02:00
parent 76eb4f3bfd
commit d1ef8180f9
59 changed files with 825 additions and 430 deletions
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28
compiler/rustc_ast_passes/src/ast_validation.rs
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@ -119,7 +119,33 @@ impl<'a> AstValidator<'a> {
/// Emits an error banning the `let` expression provided in the given location.
fn ban_let_expr(&self, expr: &'a Expr, forbidden_let_reason: ForbiddenLetReason) {
self.session.emit_err(ForbiddenLet { span: expr.span, reason: forbidden_let_reason });
let sess = &self.session;
if sess.opts.unstable_features.is_nightly_build() {
let err = "`let` expressions are not supported here";
let mut diag = sess.struct_span_err(expr.span, err);
diag.note("only supported directly in conditions of `if` and `while` expressions");
match forbidden_let_reason {
ForbiddenLetReason::GenericForbidden => {}
ForbiddenLetReason::NotSupportedOr(span) => {
diag.span_note(
span,
"`||` operators are not supported in let chain expressions",
);
}
ForbiddenLetReason::NotSupportedParentheses(span) => {
diag.span_note(
span,
"`let`s wrapped in parentheses are not supported in a context with let \
chains",
);
}
}
diag.emit();
} else {
sess.struct_span_err(expr.span, "expected expression, found statement (`let`)")
.note("variable declaration using `let` is a statement")
.emit();
}
}
fn check_gat_where(