ErrLookup › gleam-lang/gleam

gleam-lang/gleam

⭐️ A friendly language for building type-safe, scalable systems! · Rust · 173 source files

Analyzed at 49f8762da5 on 2026-09-20. 116 documented errors.

Code / Message	Type	Severity	Tags
ErrorType::ConflictingEndiannessOptions	validation	error	gleam, bit-array, conflicting-options, endianness
invalid constants should not reach code generation	panic	error	compiler, panic, code-generation, error-recovery
aliased non constant value	panic	error	panic, internal-invariant, bit-array, pattern-matching, compiler-bug
Unknown labels first label	panic	error	rust, compiler, labels, diagnostics, invariant
Error setting Ctrl-C handler	panic	error	signals, ctrl-c, erlang-shell, rust, panic, gleam, run
unreachable	panic	error	panic, unreachable, internal-invariant, javascript, bit-array
wrong number of subjects	panic	error	rust, compiler, pattern-matching, panic
OAuth credentials TOML encoding	panic	error	rust, toml, serialization, oauth, panic
unexpected segment value pattern	panic	error	panic, internal-invariant, bit-array, pattern-matching, compiler
Hydrator must not store non generic types here	panic	error	type-system, internal-invariant, compiler-bug, panic
Custom type constructor must have custom type kind	panic	error	rust, compiler, pattern-matching, panic
Output should be UTF-8	panic	error	git, utf8, encoding, panic
variable with no constructor	panic	error	rust, compiler, codegen, bit-array, invariant
Custom type variants must exist	panic	error	rust, compiler, exhaustiveness, custom-types, invariant
entry mode	panic	error	rust, tar, test-panic, file-permissions
Error printing produced invalid utf8	panic	error	rust, compiler, utf8, diagnostics
write new line after diagnostic	panic	error	rust, compiler, io, diagnostics, broken-pipe
Unable to convert HTTP request for use by reqwest library	panic	error	http, reqwest, panic, network
list has a type argument	panic	error	rust, compiler, exhaustiveness, lists, invariant
Token could not be converted to binop.	panic	error	rust, parser, panic, internal-invariant
deny.toml advisory missing deadline! Add a line to the…	panic	error	rust, cargo-deny, ci, policy-check, configuration
Failed to split 'b' slice	panic	error	rust, compiler, levenshtein, invariant
Tried to reduce bit array size without 2 operands	panic	error	rust, parser, panic, internal-invariant
Term must exist	panic	error	rust, compiler, diagnostics, panic
Index out of bounds	panic	error	cli, internal, panic, string-matching
Type has already checked to be valid	panic	error	compiler, panic, internal-invariant, type-inference
Should be a named type	panic	error	rust, compiler, pattern-matching, panic
invalid slice type made it to code generation	panic	error	panic, internal-invariant, javascript, bit-array, unsupported-operation
invalid segment type in exhaustiveness	panic	error	panic, internal-invariant, bit-array, type-mismatch, compiler
ErrorType::SignednessUsedOnNonInt	validation	error	compiler, bit-array, type-error, gleam
invalid constants can not be in an untyped ast	panic	error	ast, type-inference, internal-invariant, parser, panic
Unable to start Tokio async runtime	panic	error	rust, tokio, runtime, panic
BEAM compiler instance exited	panic	error	compiler, process, beam, erlang
Source files missing SPDX licence information! Add a…	panic	warning	licence, spdx, ci, test-suite, contribution
bytes must not be empty	panic	error	rust, bit-array, panic, pattern-matching
Unexpected file extension for	panic	error	rust, ci, license-check, repository-hygiene
invalid pattern inside aliased bit array pattern segment	panic	error	compiler, internal, bit-array, pattern-matching
Non Utf8 Path	panic	error	rust, filesystem, panic, encoding
failed regex to match valid but non-lowercase name format	panic	error	regex, panic, internal, project-name
invalid pattern size made it to code generation	panic	error	panic, internal-invariant, bit-array, codegen, compiler
could not lock beam_compiler	panic	critical	concurrency, mutex-poisoned, panic, rust
Expected t1 to be a direct link but found	panic	error	type-system, unification, test-assertion, compiler-development
Source path should be under base	panic	error	filesystem, symlink, rust, panic, hardlink
Failed to get current directory	panic	error	filesystem, test, panic, cwd
Non-UTF8 path in hardlink_dir	panic	error	filesystem, encoding, rust, panic, hardlink
invalid segment	panic	error	compiler, internal, bit-array, type-checking
Attempt to download non-hex package from hex	panic	error	panic, hex, dependency-management, manifest, checksum
ErrorType::ConstantSizeNotPositive	validation	error	compiler, bit-array, pattern-error, gleam
channel buffer write	panic	error	rust, io, panic, internal-invariant
unimplemented	panic	error	panic, not-implemented, in-memory-filesystem, io, stub
failed regex to match valid name format	panic	error	regex, panic, internal, project-name
trailing_zeros to return a value for non-zero numbers	panic	error	rust, integers, bit-width, panic
should create archive	panic	error	rust, tests, tar, archive, panic
entry path	panic	error	rust, tar, test-panic, path-parsing
Expression not fully reduced.	panic	error	parser, panic, precedence, internal-invariant
unknown pattern id	panic	error	rust, compiler, panics, exhaustiveness
uninferred constructor made it to codegen	panic	error	compiler, internal, pattern-matching, codegen
no unconditional patterns left	panic	error	rust, compiler, panics, exhaustiveness, patterns
UTF-codepoint pattern matching is not supported	error_code	error	gleam, bit-array, javascript-target, pattern-matching
invalid expressions should not reach code generation	panic	error	compiler, panic, code-generation, internal-invariant
wrong number of subject variables for pattern	panic	error	rust, compiler, pattern-matching, panic
case with no subjects	panic	error	rust, compiler, pattern-matching, panic
failed regex to match consecutive underscores	panic	error	regex, panic, internal, project-name
hostname	panic	error	rust, hostname, oauth, panic, environment
wrong index for inferred variant	panic	error	rust, compiler, panics, exhaustiveness, variants
Failed to split 'a' slice	panic	error	rust, compiler, levenshtein, invariant
Non Utf-8 Path	panic	error	filesystem, encoding, utf-8, panic
stdin read_line	panic	error	rust, stdin, oauth, panic, tty
check to already be a choice	panic	error	rust, compiler, panics, exhaustiveness, overlaps
Radix not implemented	panic	error	rust, lexer, panic, numeric-literals
Writing warning to stderr	panic	error	rust, stderr, panic, io
ErrorType::FloatWithSize	validation	error	compiler, bit-array, value-error, gleam
Invalid bit array segment type reached code generation	panic	error	compiler, panic, bit-array, code-generation
ErrorType::InvalidEndianness	validation	error	gleam, bit-array, endianness, type-mismatch
is_gleam_path() RE regex	panic	error	regex, internal-bug, panic, rust
failed regex to match any non-lowercase and…	panic	error	regex, panic, internal, project-name
invalid folder	panic	error	filesystem, panic, cli, cwd
Directory name	panic	error	filesystem, export, erlang, panic
segment size that is not int made it through type checking	panic	error	compiler, internal, bit-array, type-checking
is_gleam_path(): strip_prefix	panic	error	filesystem, path, panic, rust
path string	panic	error	rust, tar, utf-8, test-panic
at least one choice	panic	error	rust, compiler, panics, exhaustiveness, decision-tree
pattern index	panic	error	rust, compiler, panics, exhaustiveness, patterns
unknown variant index	panic	error	rust, compiler, panics, exhaustiveness, variants
verified_releases covers every resolved hex package	panic	error	dependency-resolution, hex, cache, panic
== should be a valid range	panic	error	semver, dependency-resolution, panic, manifest
empty bit array test	panic	error	rust, compiler, panics, bit-array, exhaustiveness
ErrorType::TypeDoesNotAllowSize	validation	error	compiler, bit-array, type-error, gleam
Should not fail on two absolute paths	panic	error	rust, paths, windows, panic
ErrorType::OptionNotAllowedInValue	validation	error	gleam, bit-array, value-expression
record updates should not reach code generation	panic	error	compiler, internal, codegen, assertion
ErrorType::TypeDoesNotAllowUnit	validation	error	compiler, bit-array, type-error, gleam
Tried to reduce without 2 expressions	panic	error	parser, panic, stack-imbalance, internal-invariant
archive entry	panic	error	rust, tests, tar, panic
Custom type constructor exist for type	panic	error	rust, compiler, pattern-matching, panic
This is an extra type specifier	error_code	error	gleam, bit-array, conflicting-options
JavaScript generator could not identify imported module…	panic	error	rust, javascript, codegen, panic
Final result error writing	panic	warning	io, stderr, panic, cli
joining_lsp_threads	panic	warning	lsp, threading, panic, io
ErrorType::SegmentMustHaveSize	validation	error	gleam, bit-array, pattern-matching