Error map
E0425: cannot find value in this scope Rust: error[E0425]: cannot find value `x` in this scope
Rust · layer 4, Application & API
Centre: this error. First ring: errors it is linked with (11). Outer ring: what those are linked with. Colours show the layer of a request each error belongs to. Click any dot to re-centre the map on it; hover to follow its connections. The centre dot opens the error page.
Directly related (11)
C++: error: 'x' was not declared in this scope (undeclared identifier)
The compiler met a name it has never seen: it is misspelled, declared later, out of scope, or its header or namespace is missing.
MSVC: error C2065: 'x': undeclared identifier
Visual C++ met a name it has not seen declared — a typo, a missing header or namespace, or use outside its scope.
Rust: error[E0599]: no method named `push_str` found for struct `Vec<String>` in the current scope
The type doesn't have that method — wrong type, trait not in scope, or missing derive/feature.
Rust: error[E0432]: unresolved import `crate::utils` — maybe a missing crate `utils`?
A `use` path doesn't point to an existing module, crate or item.
Cargo: error: failed to parse manifest — feature `edition2024` is required / lock file version 4 requires `-Znext-lockfile-bump`
Your Cargo is older than the manifest or lockfile requires.
Cargo: Blocking waiting for file lock on package cache / on build directory
Another cargo process (or rust-analyzer/IDE) holds the lock, so this command waits.
Rust: error[E0433]: failed to resolve: use of undeclared type `HashMap`
A path starts with a name that isn't in scope (a type or module you didn't import).
Rust: error[E0412]: cannot find type `User` in this scope
A type name isn't defined or imported in the current module.
Rust: error[E0603]: function `helper` is private
You used an item that isn't `pub` from outside its module.
Cargo: error: failed to select a version for the requirement `serde = "^2.0"` — candidate versions found which didn't match: 1.0.197
Cargo can't find a version of a dependency satisfying the constraints you (or other crates) set.
Cargo: warning: spurious network error (2 tries remaining): [35] SSL connect error / error: failed to download from `https://index.crates.io/...`
Cargo couldn't reach crates.io (network, proxy, TLS or DNS issues).
Two steps away (33)
C/C++: undefined reference to `function' — collect2: error: ld returned 1 exit status
The linker can’t find the definition of a function or variable that was declared and used.
C/C++: error: expected ';' before 'x' — missing semicolon
The compiler reached a token where a statement should have ended — almost always a missing semicolon on the line above.
C++: error: expected primary-expression before ')' token
The parser expected a value or expression and found a token that cannot start one — often a type name passed where a value belong…
C++: error: call of overloaded 'f(int)' is ambiguous
Two or more overloads fit equally well, so the compiler refuses to guess which function you meant.
C++: error: cannot declare variable 'x' to be of abstract type 'Shape' (pure virtual functions)
You tried to create an object of a class that still has pure virtual functions; only a derived class that overrides all of them c…
C/C++: ==ERROR: AddressSanitizer: heap-buffer-overflow on address — READ/WRITE of size N
AddressSanitizer caught a read or write just outside a heap block — an array index or length that is off by one or more.
Rust: error[E0277]: the trait bound `Foo: Display` is not satisfied / `Rc<RefCell<T>>` cannot be sent between threads safely
A type doesn't implement a trait required by a function, macro or generic bound.
Rust: error[E0004]: non-exhaustive patterns: `None` not covered
A `match` doesn't handle every possible value of the type.
Rust: error[E0061]: this function takes 2 arguments but 1 argument was supplied
A call has too few or too many arguments for the function signature.
Go: declared and not used: x / "fmt" imported and not used
Go refuses to compile code with unused local variables or unused imports.
Go: cannot find package "github.com/pkg/errors" in any of: /usr/local/go/src/github.com/pkg/errors (from $GOROOT) /go/src/github.com/pkg/errors (from $GOPATH)
Go could not locate an imported package — it is not downloaded, the module is not initialised, or GOPATH mode is in effect.
Go: go: updates to go.mod needed; to update it: go mod tidy
`go.mod` is out of sync with the imports in your code, and Go is running with `-mod=readonly` (the default).
Rust: error[E0507]: cannot move out of `self.name` which is behind a shared reference
You tried to take ownership of a value through a reference (or from a Vec/Option behind `&`).
Rust: error[E0373]: closure may outlive the current function, but it borrows `v`, which is owned by the current function
A closure borrowing a local is passed somewhere that may outlive it (thread::spawn, tokio::spawn, returned closures).
Rust: error[E0384]: cannot assign twice to immutable variable `x`
You reassigned a variable declared without `mut`.
Rust: error[E0499]: cannot borrow `v` as mutable more than once at a time
Two mutable references to the same value were alive at once, which Rust forbids.
Rust: error[E0505]: cannot move out of `s` because it is borrowed
You moved a value while a reference to it was still in use.
Rust: error[E0106]: missing lifetime specifier — this function's return type contains a borrowed value, but the signature does not say which one of `x`'s 2 lifetimes it is borrowed from
The compiler can't infer which input reference the returned/stored reference is tied to.
Go: missing go.sum entry for module providing package github.com/pkg/errors (imported by app); to add: go get app
`go.sum` lacks the checksum for a dependency that your build needs.
Go: no required module provides package github.com/foo/bar; to add it: go get github.com/foo/bar
The code imports a package whose module is not listed in `go.mod`.
Go: go: github.com/foo/bar@v1.2.3: invalid version: unknown revision v1.2.3
Go cannot fetch the requested module version — the tag or branch doesn't exist, the repository is private or the proxy hasn't see…
Rust: error[E0308]: mismatched types — expected `X`, found `Y`
A value’s type doesn’t match what the context expects — common with &str vs String, Option/Result vs plain values, and integer ty…
C++: error: invalid conversion from 'const char*' to 'char*' [-fpermissive]
C++ forbids silently dropping `const` or converting between unrelated pointer types — typically a string literal assigned to `cha…
C++: error: 'string' does not name a type
Where the compiler expected a type, it found a name it does not know as one — a missing header, namespace, or class declared late…
Go: verifying module: checksum mismatch — SECURITY ERROR This download does NOT match an earlier download recorded in go.sum
A module's content hash differs from the one recorded in `go.sum` (or the public checksum database).
Go: fatal: could not read Username for 'https://github.com': terminal prompts disabled
Go tried to fetch a private repository without credentials (and, via the public proxy, got 404/410).
Rust: error[E0616]: field `name` of struct `User` is private
You accessed a struct field that isn't `pub` from outside its module.
Unmet dependencies / E: Unable to correct problems, you have held broken packages
apt can’t find a set of package versions that satisfies all dependencies — usually mixed repositories or a package from another r…
Rust: error[E0282]: type annotations needed for `Vec<_>` / consider giving `x` an explicit type
The compiler can't infer a type from the available information.
Rust: error[E0038]: the trait `Shape` cannot be made into an object (not dyn compatible)
You used `dyn Trait` for a trait whose methods aren't object-safe (generic methods, `Self` returns, `Sized`).
ssh: connect to host x port 22: Connection refused
The server answered, but nothing is listening on the SSH port — sshd isn’t running, it uses another port, or a firewall actively…
ssh: connect to host x port 22: Connection timed out
SSH packets get no reply — a firewall/security group drops them, the server is off, or the IP is wrong.
ping: google.com: Temporary failure in name resolution
The Linux host can’t resolve domain names — no working DNS server is configured or reachable.
Map another error
Popular: 500403400ORA-009331064Critical errorFileNotFoundException assemblyTypeError