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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `crates/analyzer/src/errors.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>errors.rs - source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings" ></script><script src="../../storage.js"></script><script src="../../crates.js"></script><script defer src="../../main.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script>
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</pre><pre class="rust"><code><span class="doccomment">//! Semantic errors.</span>
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::context</span>::{<span class="ident">DiagnosticVoucher</span>, <span class="ident">NamedThing</span>};
<span class="kw">use</span> <span class="ident">fe_common::diagnostics</span>::{<span class="ident">Diagnostic</span>, <span class="ident">Label</span>, <span class="ident">Severity</span>};
<span class="kw">use</span> <span class="ident">fe_common::Span</span>;
<span class="kw">use</span> <span class="ident">std::fmt::Display</span>;
<span class="doccomment">/// Error indicating that a type is invalid.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that the "type" of a thing (eg the type of a `FunctionParam`)</span>
<span class="doccomment">/// in [`crate::namespace::types`] is sometimes represented as a</span>
<span class="doccomment">/// `Result<FixedSize, TypeError>`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If, for example, a function parameter has an undefined type, we emit a [`Diagnostic`] message,</span>
<span class="doccomment">/// give that parameter a "type" of `Err(TypeError)`, and carry on. If/when that parameter is</span>
<span class="doccomment">/// used in the function body, we assume that a diagnostic message about the undefined type</span>
<span class="doccomment">/// has already been emitted, and halt the analysis of the function body.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To ensure that that assumption is sound, a diagnostic *must* be emitted before creating</span>
<span class="doccomment">/// a `TypeError`. So that the rust compiler can help us enforce this rule, a `TypeError`</span>
<span class="doccomment">/// cannot be constructed without providing a [`DiagnosticVoucher`]. A voucher can be obtained</span>
<span class="doccomment">/// by calling an error function on an [`AnalyzerContext`](crate::context::AnalyzerContext).</span>
<span class="doccomment">/// Please don't try to work around this restriction.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Example: `TypeError::new(context.error("something is wrong", some_span, "this thing"))`</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">Hash</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">TypeError</span>(<span class="ident">DiagnosticVoucher</span>);
<span class="kw">impl</span> <span class="ident">TypeError</span> {
<span class="comment">// `Clone` is required because these are stored in a salsa db.</span>
<span class="comment">// Please don't clone these manually.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">voucher</span>: <span class="ident">DiagnosticVoucher</span>) -> <span class="self">Self</span> {
<span class="self">Self</span>(<span class="ident">voucher</span>)
}
}
<span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">FatalError</span><span class="op">></span> <span class="kw">for</span> <span class="ident">TypeError</span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">err</span>: <span class="ident">FatalError</span>) -> <span class="self">Self</span> {
<span class="self">Self</span>(<span class="ident">err</span>.<span class="number">0</span>)
}
}
<span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">ConstEvalError</span><span class="op">></span> <span class="kw">for</span> <span class="ident">TypeError</span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">err</span>: <span class="ident">ConstEvalError</span>) -> <span class="self">Self</span> {
<span class="self">Self</span>(<span class="ident">err</span>.<span class="number">0</span>)
}
}
<span class="doccomment">/// Error to be returned when otherwise no meaningful information can be returned.</span>
<span class="doccomment">/// Can't be created unless a diagnostic has been emitted, and thus a [`DiagnosticVoucher`]</span>
<span class="doccomment">/// has been obtained. (See comment on [`TypeError`])</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">FatalError</span>(<span class="ident">DiagnosticVoucher</span>);
<span class="kw">impl</span> <span class="ident">FatalError</span> {
<span class="doccomment">/// Create a `FatalError` instance, given a "voucher"</span>
<span class="doccomment">/// obtained by emitting an error via an [`AnalyzerContext`](crate::context::AnalyzerContext).</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">voucher</span>: <span class="ident">DiagnosticVoucher</span>) -> <span class="self">Self</span> {
<span class="self">Self</span>(<span class="ident">voucher</span>)
}
}
<span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">ConstEvalError</span><span class="op">></span> <span class="kw">for</span> <span class="ident">FatalError</span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">err</span>: <span class="ident">ConstEvalError</span>) -> <span class="self">Self</span> {
<span class="self">Self</span>(<span class="ident">err</span>.<span class="number">0</span>)
}
}
<span class="doccomment">/// Error indicating constant evaluation failed.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This error emitted when</span>
<span class="doccomment">/// 1. an expression can't be evaluated in compilation time</span>
<span class="doccomment">/// 2. arithmetic overflow occurred during evaluation</span>
<span class="doccomment">/// 3. zero division is detected during evaluation</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Can't be created unless a diagnostic has been emitted, and thus a [`DiagnosticVoucher`]</span>
<span class="doccomment">/// has been obtained. (See comment on [`TypeError`])</span>
<span class="doccomment">///</span>
<span class="doccomment">/// NOTE: `Clone` is required because these are stored in a salsa db.</span>
<span class="doccomment">/// Please don't clone these manually.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">Hash</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ConstEvalError</span>(<span class="ident">DiagnosticVoucher</span>);
<span class="kw">impl</span> <span class="ident">ConstEvalError</span> {
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">voucher</span>: <span class="ident">DiagnosticVoucher</span>) -> <span class="self">Self</span> {
<span class="self">Self</span>(<span class="ident">voucher</span>)
}
}
<span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">TypeError</span><span class="op">></span> <span class="kw">for</span> <span class="ident">ConstEvalError</span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">err</span>: <span class="ident">TypeError</span>) -> <span class="self">Self</span> {
<span class="self">Self</span>(<span class="ident">err</span>.<span class="number">0</span>)
}
}
<span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">FatalError</span><span class="op">></span> <span class="kw">for</span> <span class="ident">ConstEvalError</span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">err</span>: <span class="ident">FatalError</span>) -> <span class="self">Self</span> {
<span class="self">Self</span>(<span class="ident">err</span>.<span class="number">0</span>)
}
}
<span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">IncompleteItem</span><span class="op">></span> <span class="kw">for</span> <span class="ident">ConstEvalError</span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">err</span>: <span class="ident">IncompleteItem</span>) -> <span class="self">Self</span> {
<span class="self">Self</span>(<span class="ident">err</span>.<span class="number">0</span>)
}
}
<span class="doccomment">/// Error returned by `ModuleId::resolve_name` if the name is not found, and parsing of the module</span>
<span class="doccomment">/// failed. In this case, emitting an error message about failure to resolve the name might be misleading,</span>
<span class="doccomment">/// because the file may in fact contain an item with the given name, somewhere after the syntax error that caused</span>
<span class="doccomment">/// parsing to fail.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">IncompleteItem</span>(<span class="ident">DiagnosticVoucher</span>);
<span class="kw">impl</span> <span class="ident">IncompleteItem</span> {
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy::new_without_default</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() -> <span class="self">Self</span> {
<span class="self">Self</span>(<span class="ident">DiagnosticVoucher::assume_the_parser_handled_it</span>())
}
}
<span class="doccomment">/// Error to be returned from APIs that should reject duplicate definitions</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">AlreadyDefined</span>;
<span class="doccomment">/// Error indicating that a value can not move between memory and storage</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">CannotMove</span>;
<span class="doccomment">/// Error indicating that a [`Type`] can't be converted into a [`FixedSize`]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">NotFixedSize</span>;
<span class="doccomment">/// Errors that can result from indexing</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">IndexingError</span> {
<span class="ident">WrongIndexType</span>,
<span class="ident">NotSubscriptable</span>,
}
<span class="doccomment">/// Errors that can result from a binary operation</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">BinaryOperationError</span> {
<span class="ident">TypesNotEqual</span>,
<span class="ident">TypesNotNumeric</span>,
<span class="ident">RightTooLarge</span>,
<span class="ident">RightIsSigned</span>,
<span class="ident">NotEqualAndUnsigned</span>,
}
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">AnalyzerError</span>(<span class="kw">pub</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">Diagnostic</span><span class="op">></span>);
<span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">TypeError</span><span class="op">></span> <span class="kw">for</span> <span class="ident">FatalError</span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">err</span>: <span class="ident">TypeError</span>) -> <span class="self">Self</span> {
<span class="ident"><span class="self">Self</span>::new</span>(<span class="ident">err</span>.<span class="number">0</span>)
}
}
<span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">IncompleteItem</span><span class="op">></span> <span class="kw">for</span> <span class="ident">FatalError</span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">err</span>: <span class="ident">IncompleteItem</span>) -> <span class="self">Self</span> {
<span class="ident"><span class="self">Self</span>::new</span>(<span class="ident">err</span>.<span class="number">0</span>)
}
}
<span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">IncompleteItem</span><span class="op">></span> <span class="kw">for</span> <span class="ident">TypeError</span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">err</span>: <span class="ident">IncompleteItem</span>) -> <span class="self">Self</span> {
<span class="ident"><span class="self">Self</span>::new</span>(<span class="ident">err</span>.<span class="number">0</span>)
}
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">error</span>(<span class="ident">message</span>: <span class="kw">impl</span> <span class="ident">Into</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>, <span class="ident">label_span</span>: <span class="ident">Span</span>, <span class="ident">label</span>: <span class="kw">impl</span> <span class="ident">Into</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>) -> <span class="ident">Diagnostic</span> {
<span class="ident">fancy_error</span>(<span class="ident">message</span>, <span class="macro">vec!</span>[<span class="ident">Label::primary</span>(<span class="ident">label_span</span>, <span class="ident">label</span>)], <span class="macro">vec!</span>[])
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fancy_error</span>(
<span class="ident">message</span>: <span class="kw">impl</span> <span class="ident">Into</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>,
<span class="ident">labels</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">Label</span><span class="op">></span>,
<span class="ident">notes</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>,
) -> <span class="ident">Diagnostic</span> {
<span class="ident">Diagnostic</span> {
<span class="ident">severity</span>: <span class="ident">Severity::Error</span>,
<span class="ident">message</span>: <span class="ident">message</span>.<span class="ident">into</span>(),
<span class="ident">labels</span>,
<span class="ident">notes</span>,
}
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">type_error</span>(
<span class="ident">message</span>: <span class="kw">impl</span> <span class="ident">Into</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>,
<span class="ident">span</span>: <span class="ident">Span</span>,
<span class="ident">expected</span>: <span class="kw">impl</span> <span class="ident">Display</span>,
<span class="ident">actual</span>: <span class="kw">impl</span> <span class="ident">Display</span>,
) -> <span class="ident">Diagnostic</span> {
<span class="ident">error</span>(
<span class="ident">message</span>,
<span class="ident">span</span>,
<span class="macro">format!</span>(<span class="string">"this has type `{}`; expected type `{}`"</span>, <span class="ident">actual</span>, <span class="ident">expected</span>),
)
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">not_yet_implemented</span>(<span class="ident">feature</span>: <span class="kw">impl</span> <span class="ident">Display</span>, <span class="ident">span</span>: <span class="ident">Span</span>) -> <span class="ident">Diagnostic</span> {
<span class="ident">error</span>(
<span class="macro">format!</span>(<span class="string">"feature not yet implemented: {}"</span>, <span class="ident">feature</span>),
<span class="ident">span</span>,
<span class="string">"not yet implemented"</span>,
)
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">duplicate_name_error</span>(
<span class="ident">message</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">name</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">original</span>: <span class="ident">Span</span>,
<span class="ident">duplicate</span>: <span class="ident">Span</span>,
) -> <span class="ident">Diagnostic</span> {
<span class="ident">fancy_error</span>(
<span class="ident">message</span>,
<span class="macro">vec!</span>[
<span class="ident">Label::primary</span>(<span class="ident">original</span>, <span class="macro">format!</span>(<span class="string">"`{}` first defined here"</span>, <span class="ident">name</span>)),
<span class="ident">Label::secondary</span>(<span class="ident">duplicate</span>, <span class="macro">format!</span>(<span class="string">"`{}` redefined here"</span>, <span class="ident">name</span>)),
],
<span class="macro">vec!</span>[],
)
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">name_conflict_error</span>(
<span class="ident">name_kind</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="comment">// Eg "function parameter" or "variable name"</span>
<span class="ident">name</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">original</span>: <span class="kw-2">&</span><span class="ident">NamedThing</span>,
<span class="ident">original_span</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Span</span><span class="op">></span>,
<span class="ident">duplicate_span</span>: <span class="ident">Span</span>,
) -> <span class="ident">Diagnostic</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">original_span</span>) <span class="op">=</span> <span class="ident">original_span</span> {
<span class="ident">fancy_error</span>(
<span class="kw-2">&</span><span class="macro">format!</span>(
<span class="string">"{} name `{}` conflicts with previously defined {}"</span>,
<span class="ident">name_kind</span>,
<span class="ident">name</span>,
<span class="ident">original</span>.<span class="ident">item_kind_display_name</span>()
),
<span class="macro">vec!</span>[
<span class="ident">Label::primary</span>(<span class="ident">original_span</span>, <span class="macro">format!</span>(<span class="string">"`{}` first defined here"</span>, <span class="ident">name</span>)),
<span class="ident">Label::secondary</span>(<span class="ident">duplicate_span</span>, <span class="macro">format!</span>(<span class="string">"`{}` redefined here"</span>, <span class="ident">name</span>)),
],
<span class="macro">vec!</span>[],
)
} <span class="kw">else</span> {
<span class="ident">fancy_error</span>(
<span class="kw-2">&</span><span class="macro">format!</span>(
<span class="string">"{} name `{}` conflicts with built-in {}"</span>,
<span class="ident">name_kind</span>,
<span class="ident">name</span>,
<span class="ident">original</span>.<span class="ident">item_kind_display_name</span>()
),
<span class="macro">vec!</span>[<span class="ident">Label::primary</span>(
<span class="ident">duplicate_span</span>,
<span class="macro">format!</span>(
<span class="string">"`{}` is a built-in {}"</span>,
<span class="ident">name</span>,
<span class="ident">original</span>.<span class="ident">item_kind_display_name</span>()
),
)],
<span class="macro">vec!</span>[],
)
}
}
</code></pre></div>
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