Diagnostics

Every code the toolchain reports. lyric explain prints a code's page in the terminal.

Lexing LEX

`LYR-LEX0001`	a character that starts no token, or a name beyond ASCII	error
`LYR-LEX0002`	a block comment that is not closed	error
`LYR-LEX0003`	a numeric literal with a suffix that does not fit it	error
`LYR-LEX0004`	a base prefix with no digits after it	error
`LYR-LEX0005`	a digit separator right after a base prefix	error
`LYR-LEX0006`	an exponent with no digits	error
`LYR-LEX0007`	a malformed escape sequence	error
`LYR-LEX0008`	a character literal that holds no character or several	error
`LYR-LEX0009`	a string literal that is not closed	error
`LYR-LEX0010`	a character literal that is not closed	error
`LYR-LEX0011`	an f-string that is not closed	error
`LYR-LEX0012`	a byte string holding no byte, or an '@' without a name	error
`LYR-LEX0013`	a byte escape in a string or character	error
`LYR-LEX0014`	a multi-line string whose quotes do not stand on lines of their own	error
`LYR-LEX0015`	a line of a multi-line string indented less than its closing quotes	error
`LYR-LEX0016`	a float literal without digits on one side of its point	error

Parsing PAR

`LYR-PAR0001`	a token after one whole expression, pattern or statement	error, retired
`LYR-PAR0002`	an expression is missing	error
`LYR-PAR0003`	a member name or a compile-time form is incomplete	error
`LYR-PAR0004`	a ']' is missing	error
`LYR-PAR0005`	range operators chained	error
`LYR-PAR0006`	a numeric literal with an unknown suffix	error
`LYR-PAR0007`	a numeric literal too large	error
`LYR-PAR0008`	a parenthesis is missing	error
`LYR-PAR0009`	an angle bracket of a type list is missing	error
`LYR-PAR0010`	a tuple of fewer than two elements, or a label given twice	error
`LYR-PAR0011`	a type is missing	error
`LYR-PAR0012`	a lambda without '=>' before its body	error
`LYR-PAR0013`	a lambda parameter without a name	error
`LYR-PAR0014`	an interpolation not closed by '}'	error
`LYR-PAR0015`	a function type without '->'	error
`LYR-PAR0016`	a ';' is missing	error
`LYR-PAR0017`	a '{' is missing, or a body without braces	error
`LYR-PAR0018`	a '}' is missing	error
`LYR-PAR0019`	a '(' is missing after a keyword	error
`LYR-PAR0020`	a binding without its name, pattern or value	error
`LYR-PAR0021`	a for loop without 'in'	error
`LYR-PAR0022`	a do block without 'while'	error
`LYR-PAR0025`	something else than a declaration at module level	error
`LYR-PAR0026`	a name is missing	error
`LYR-PAR0028`	a type alias without '='	error
`LYR-PAR0029`	fields of a struct or class without ',' between them	error
`LYR-PAR0030`	a list after '::' without its '['	error, retired
`LYR-PAR0031`	a parameter or field without ':' before its type	error
`LYR-PAR0032`	a function without 'fn', or its words out of order	error
`LYR-PAR0033`	a malformed pattern	error
`LYR-PAR0034`	a match arm without '=>'	error
`LYR-PAR0035`	match arms without ',' between them	error
`LYR-PAR0036`	an if expression without 'else'	error
`LYR-PAR0037`	a field in an initializer without '='	error
`LYR-PAR0041`	a static member in an interface	error, retired
`LYR-PAR0042`	an attribute with no declaration to carry it	error
`LYR-PAR0043`	an inline array of no positive literal length	error
`LYR-PAR0044`	an extern symbol that is not a string	error
`LYR-PAR0045`	nesting deeper than the parser carries	error
`LYR-PAR0046`	a label on something that is no loop	error
`LYR-PAR0047`	'by' where nothing is delegated	error
`LYR-PAR0048`	'sealed' before something that is no interface	error
`LYR-PAR0049`	several types not in brackets, or an empty type list	error
`LYR-PAR0050`	a 'try' that changes the value, not at the start	error
`LYR-PAR0051`	a 'catch' clause on 'try?' or 'try!'	error
`LYR-PAR0052`	a 'using' that is not one 'let' with a value	error
`LYR-PAR0053`	a visibility word where none or another belongs	error
`LYR-PAR0054`	'&' outside an argument	error
`LYR-PAR0055`	an initializer at the start of a statement	error
`LYR-PAR0056`	a 'throws' behind a function type that is a return type	error
`LYR-PAR0057`	an enum's variants not ended by ';' before its members	error
`LYR-PAR0058`	'&' before a lambda parameter's pattern	error
`LYR-PAR0059`	comparisons or equalities chained	error
`LYR-PAR0060`	a local function that is not one plain closure	error
`LYR-PAR0061`	a 'comptime if' in expression position without 'else'	error
`LYR-PAR0062`	a 'comptime for' in an initializer without '[f] = e'	error
`LYR-PAR0063`	'quote' without a block	error
`LYR-PAR0064`	a field that ends with ';'	error
`LYR-PAR0065`	a 'continue', 'break' or 'return' where a value stands	error
`LYR-PAR0066`	several interfaces after '::' without brackets	error
`LYR-PAR0067`	an 'unsafe' block where a value stands	error

Names RES

`LYR-RES0001`	a name declared twice in one scope	error
`LYR-RES0002`	a type name that names no type	error
`LYR-RES0003`	an import of a module that does not exist	error
`LYR-RES0004`	an imported name the module does not declare	error
`LYR-RES0005`	modules that import each other	error
`LYR-RES0006`	a file whose module header disagrees with its path	error, retired
`LYR-RES0007`	two files that are the same module	error
`LYR-RES0008`	a module header	error
`LYR-RES0009`	a name the place may not see	error
`LYR-RES0010`	a pub import of a name that is not pub	error
`LYR-RES0011`	a declaration that takes a builtin type's name	error
`LYR-RES0012`	a name that is also a submodule	error
`LYR-RES0013`	a single file named std.lyr	error
`LYR-RES0014`	an import of a package the manifest does not declare	error
`LYR-RES0015`	a test module under both src/tests/ and tests/	error
`LYR-RES0016`	a module made from a C header lies in the package's source too	error

Checking SEM

`LYR-SEM0001`	a value of another type than the place takes	error
`LYR-SEM0002`	a name that nothing in scope declares	error
`LYR-SEM0003`	an operator its operands do not provide	error
`LYR-SEM0004`	a condition that is not a bool	error
`LYR-SEM0005`	a null operator on a value that is never null	error
`LYR-SEM0006`	a conversion that does not exist	error
`LYR-SEM0007`	a value that cannot be indexed or iterated	error
`LYR-SEM0008`	this outside a method	error
`LYR-SEM0009`	array elements of different types	error
`LYR-SEM0010`	a binding whose type nothing fixes	error
`LYR-SEM0011`	a name in type position that is no type	error
`LYR-SEM0012`	a member the type does not have	error
`LYR-SEM0013`	a call on something that is not a function	error
`LYR-SEM0014`	a call with the wrong number of arguments	error
`LYR-SEM0015`	a field the type does not declare	error
`LYR-SEM0016`	branches whose types do not unify	error
`LYR-SEM0017`	a path of a function that returns no value	error
`LYR-SEM0018`	a variable read before it is surely assigned	error
`LYR-SEM0019`	a write to something that cannot be written	error
`LYR-SEM0020`	a conformance that leaves an interface member unimplemented	error
`LYR-SEM0021`	a missing, duplicated or malformed main	error
`LYR-SEM0022`	an expression statement without an effect	error
`LYR-SEM0023`	a mut function that has nothing to write	error
`LYR-SEM0024`	a variadic parameter out of place	error
`LYR-SEM0026`	the wrong number of type arguments	error
`LYR-SEM0027`	a member of a type parameter that no constraint provides	error
`LYR-SEM0028`	a type argument that does not satisfy its constraint	error
`LYR-SEM0029`	a pattern that cannot match the scrutinee's type	error
`LYR-SEM0030`	a thrown, declared or caught type that is not an Error	error
`LYR-SEM0031`	an enum variant used against its shape	error
`LYR-SEM0032`	or-pattern alternatives that bind differently	error
`LYR-SEM0033`	a block that gives no value where one is wanted	error
`LYR-SEM0034`	an error that nothing handles	error
`LYR-SEM0035`	a catch-all clause before another clause	error
`LYR-SEM0036`	a try block without a catch	error
`LYR-SEM0038`	a bare yield in a coroutine that yields values	error
`LYR-SEM0039`	a value returned from a coroutine that returns nothing	error
`LYR-SEM0042`	an implementation that does not match the interface's signature	error
`LYR-SEM0043`	one member defaulted by two interfaces	error
`LYR-SEM0045`	a lambda parameter whose type nothing gives	error
`LYR-SEM0046`	a lambda that can end without its value	error
`LYR-SEM0047`	an extend target or conversion not supported	error
`LYR-SEM0050`	a match that does not cover every value	error
`LYR-SEM0051`	a function without a body	error
`LYR-SEM0052`	a type, module or generic function used as a value	error
`LYR-SEM0053`	an attribute used as an expression	error
`LYR-SEM0054`	a static member declared 'mut'	error
`LYR-SEM0055`	a member that needs a receiver named without one	error
`LYR-SEM0056`	a value type that contains itself	error
`LYR-SEM0057`	a global read before it is initialized	error
`LYR-SEM0058`	a destructuring that does not fit the value	error
`LYR-SEM0059`	an equality, null or membership test the type does not support	error
`LYR-SEM0060`	a type argument nothing determines	error
`LYR-SEM0061`	a host type constructed in the program	error, retired
`LYR-SEM0062`	'?.' calling a field that holds a function	error
`LYR-SEM0063`	a generic type named without its type arguments	error
`LYR-SEM0064`	a type alias that expands to itself	error
`LYR-SEM0065`	an attribute that cannot stand here	error
`LYR-SEM0066`	an attribute argument that is not a compile-time value	error, retired
`LYR-SEM0067`	an attribute on a generic declaration	error
`LYR-SEM0068`	an attribute repeated on one declaration	error
`LYR-SEM0069`	an attribute field left without a compile-time value	error, retired
`LYR-SEM0070`	a field written twice in one initializer or 'with'	error
`LYR-SEM0071`	a local that is never used	warning
`LYR-SEM0072`	an import that is never used	warning
`LYR-SEM0073`	an unreachable statement	warning
`LYR-SEM0074`	a static extension called on a value	error
`LYR-SEM0075`	a 'var' that is never reassigned	warning
`LYR-SEM0076`	a use of a deprecated declaration	warning
`LYR-SEM0077`	an import that shadows a builtin type	warning
`LYR-SEM0078`	a conformance or parent list entry that does not fit	error
`LYR-SEM0079`	an interface member inherited twice or redeclared	error
`LYR-SEM0081`	a deprecation whose release has come or that names no version	error
`LYR-SEM0082`	a member replacing a generic default of a generic interface	error
`LYR-SEM0083`	an operator with two conformances that fit the operand	error
`LYR-SEM0084`	'throws' on a type that is no coroutine or task	error
`LYR-SEM0085`	two functions of one name taking the same number of arguments	error
`LYR-SEM0086`	a call that more than one function of the name fits	error
`LYR-SEM0087`	a call that no function of the name takes	error
`LYR-SEM0088`	an overloaded interface member	error
`LYR-SEM0089`	a shared function name used as a value without a type to choose by	error
`LYR-SEM0090`	a range value without std.core's 'Range'	error, retired
`LYR-SEM0091`	a loop over optional elements without the iterator protocol	error, retired
`LYR-SEM0092`	inference through a type that conforms twice	error
`LYR-SEM0093`	an opaque type made outside its module	error, retired
`LYR-SEM0094`	a parenthesized attribute value with no one field to fill	error
`LYR-SEM0095`	an attribute whose 'WithArg' promise its first field breaks	error, retired
`LYR-SEM0096`	an attribute with a field a metadata row cannot hold	error, retired
`LYR-SEM0097`	a name bound twice in one pattern	error
`LYR-SEM0098`	a refutable pattern without a path for a miss	error
`LYR-SEM0099`	an extern declaration that cannot cross into C	error
`LYR-SEM0100`	a 'comptime' form that cannot be evaluated while compiling	error
`LYR-SEM0101`	a jump to a label no enclosing loop carries	error
`LYR-SEM0102`	a label that repeats the label of an enclosing loop	error
`LYR-SEM0103`	a loop label nothing jumps to	warning
`LYR-SEM0104`	a pattern that cannot fail where a test is promised	warning
`LYR-SEM0105`	an expression or type nested deeper than the checker walks	error
`LYR-SEM0106`	an initializer that omits a field without a default	error
`LYR-SEM0111`	a bare name in a pattern that spells a variant of the scrutinee's enum	error
`LYR-SEM0112`	a match arm no value can reach	warning
`LYR-SEM0113`	an implicit member where no enum is expected	error
`LYR-SEM0114`	a from-the-end index '^n' outside the place it means something	error
`LYR-SEM0115`	a view of an inline array that lies in a frame	error
`LYR-SEM0116`	'with' on something other than a struct	error
`LYR-SEM0117`	the placeholder type '_' where nothing infers it	error
`LYR-SEM0118`	a visibility word on an interface member	error
`LYR-SEM0119`	a named argument that does not fit the parameters	error
`LYR-SEM0120`	a parameter default that reads 'this'	error
`LYR-SEM0121`	a second member of one name on a type	error
`LYR-SEM0122`	an unqualified call of a name two conformance blocks implement	error
`LYR-SEM0123`	a delegated conformance whose field cannot answer it	error
`LYR-SEM0124`	an extend block on an interface	error
`LYR-SEM0125`	a qualified interface call on a receiver that does not conform	error
`LYR-SEM0126`	an interface usable only as a constraint used as a value type	error
`LYR-SEM0127`	a value for an interface's static 'let'	error
`LYR-SEM0128`	an associated type that is not answered or not declared	error
`LYR-SEM0129`	an associated type answer that no interface asks for	error
`LYR-SEM0131`	a type test that asks nothing an interface value could answer	error
`LYR-SEM0132`	a conformance to a sealed interface outside its module	error
`LYR-SEM0133`	two conformances of one type to one interface	error
`LYR-SEM0134`	a member of a constrained block on a type that fails its constraints	error
`LYR-SEM0135`	a conformance the compiler cannot synthesize, or Identity on a value	error
`LYR-SEM0136`	a repeated array literal of an element that would need cloning	error
`LYR-SEM0137`	a type named twice in one 'throws' set	error
`LYR-SEM0138`	a call that may throw without a 'try' mark	error
`LYR-SEM0139`	a 'try' mark over nothing that can throw	warning
`LYR-SEM0140`	'try?' over a call without a value, used as a value	error
`LYR-SEM0141`	an error type caught twice by one 'try'	error
`LYR-SEM0142`	a 'catch' clause no error can reach	error
`LYR-SEM0143`	'using' on a value that is not Closeable	error
`LYR-SEM0144`	a Closeable value nothing closes	warning
`LYR-SEM0145`	'never' where a value of it would have to exist	error
`LYR-SEM0146`	a 'return' in a function returning 'never'	error
`LYR-SEM0147`	'break' or 'continue' outside a loop	error
`LYR-SEM0148`	a 'break' with a value out of a 'while' or 'for'	error
`LYR-SEM0149`	a 'loop' whose breaks give a value only in part	error
`LYR-SEM0150`	a visibility word on a conformance or its methods	error
`LYR-SEM0151`	a declaration names a type less visible than itself	error
`LYR-SEM0152`	a member is written wider than its type	warning
`LYR-SEM0153`	a name hides one of the prelude's	warning
`LYR-SEM0154`	a test takes parameters, returns a value or is private	error
`LYR-SEM0155`	a caller attribute sits on the wrong parameter	error
`LYR-SEM0156`	a place argument or parameter that is no place	error
`LYR-SEM0157`	an argument's place mark does not fit its parameter	error
`LYR-SEM0158`	a place outlives the call that handed it over	error
`LYR-SEM0160`	an associated type's answer does not meet its bound	error
`LYR-SEM0161`	an associated type's answer carries a bound	error
`LYR-SEM0162`	a second loop over the same iterator	warning
`LYR-SEM0163`	a loop's head takes 'try?', 'try!' or a catching form	error
`LYR-SEM0164`	a format spec in an f-string hole is malformed or does not apply	error
`LYR-SEM0165`	a 'throws' behind a task or coroutine return type is ambiguous	error
`LYR-SEM0166`	a spread argument is not the whole rest of a variadic call	error
`LYR-SEM0167`	an implementing member is less visible than its conformance	error
`LYR-SEM0168`	a type's member hides a blanket member	warning
`LYR-SEM0169`	a generic type's constant is not a constant expression	error
`LYR-SEM0170`	an extend block's type parameter is bound by nothing	error
`LYR-SEM0171`	a catch-all clause that nothing reaches	warning
`LYR-SEM0172`	a 'mut fn' generator on a value type changes a copy	warning
`LYR-SEM0173`	a binding or parameter holds a 'void'	warning
`LYR-SEM0174`	a closeable iterator's close() throws more than its Error allows	error
`LYR-SEM0175`	'opaque type' is no form of Lyric 5	error
`LYR-SEM0176`	a name is bound twice in one scope	error
`LYR-SEM0177`	'@AlwaysInline' and '@NoInline' on one function	error
`LYR-SEM0178`	the value of a '@MustUse' call is dropped	warning
`LYR-SEM0179`	a lint attribute names no lint	error
`LYR-SEM0180`	an '@Allow' that takes back nothing	warning
`LYR-SEM0181`	an inline function keeps a function parameter	error
`LYR-SEM0182`	an inline function reaches itself	error
`LYR-SEM0183`	an inline function used as a value	error
`LYR-SEM0184`	a function that cannot be inline	error
`LYR-SEM0185`	a reflection access outside a round of its own	error
`LYR-SEM0186`	a macro's signature is not syntax to syntax	error
`LYR-SEM0187`	a macro called as a function	error
`LYR-SEM0188`	a macro's result does not fit its site	error
`LYR-SEM0189`	a macro expanded in its own module	error
`LYR-SEM0190`	a macro site names no macro	error
`LYR-SEM0191`	a macro site's arguments do not fit the macro	error
`LYR-SEM0193`	a splice outside a quote or of the wrong kind	error
`LYR-SEM0194`	a quote in a program that does not reach std.syntax	error
`LYR-SEM0195`	a part of the standard library the lowering needs is missing	error
`LYR-SEM0196`	a delegation the lowering cannot express yet	error, retired
`LYR-SEM0197`	the monomorphization does not terminate	error
`LYR-SEM0198`	a parameter that is never used	warning
`LYR-SEM0199`	a 'var' that is written and never read	warning
`LYR-SEM0200`	a type parameter that is never used	warning
`LYR-SEM0201`	a declaration nothing uses	warning
`LYR-SEM0202`	an assignment written as a condition	warning
`LYR-SEM0203`	an assignment of a value to itself	warning
`LYR-SEM0204`	a comparison of an unsigned value with 0 that cannot fail	warning
`LYR-SEM0205`	an equality test on floats	warning
`LYR-SEM0206`	a local that hides one of the same name	warning
`LYR-SEM0207`	a local that hides a module the file imports	warning
`LYR-SEM0208`	an integer literal that takes another type than int	warning
`LYR-SEM0209`	a block's implicit 'it' that hides the 'it' around it	warning
`LYR-SEM0210`	an exit code outside 0 to 255	warning
`LYR-SEM0211`	a conformance of another package's type to another package's interface	warning
`LYR-SEM0212`	a task's handle dropped	warning
`LYR-SEM0213`	a module 'var' in a program that starts threads	warning
`LYR-SEM0214`	a construct an edition retires	warning
`LYR-SEM0215`	a name against the naming convention	warning
`LYR-SEM0216`	a module named as a Windows device	warning
`LYR-SEM0217`	'clone()' of a value a copy makes whole	warning
`LYR-SEM0218`	a 'return;' that ends a body	warning
`LYR-SEM0219`	'while (true)' where 'loop' is meant	warning
`LYR-SEM0220`	a string grown with '+' in a loop	warning
`LYR-SEM0221`	a large struct passed by value	warning
`LYR-SEM0222`	a value boxed as an interface in a loop	warning
`LYR-SEM0223`	a pub declaration without documentation	warning
`LYR-SEM0224`	a doc link that names nothing	warning
`LYR-SEM0225`	a module without module documentation	warning
`LYR-SEM0226`	a 'return' without the value the function returns	error
`LYR-SEM0227`	an integer literal too large for 'int'	error
`LYR-SEM0228`	an inline array of another length	error
`LYR-SEM0229`	a place of another type than the place parameter	error
`LYR-SEM0230`	an interface value made through a shape's or a blanket block	error, retired
`LYR-SEM0231`	a static member of an interface called through the interface	error
`LYR-SEM0232`	a loop over a string	error
`LYR-SEM0233`	a memory operation outside an unsafe block	error
`LYR-SEM0234`	an unsafe block that holds no memory operation	warning
`LYR-SEM0235`	a member two seen modules add	error
`LYR-SEM0236`	a jump out of a 'defer' body	error

Compile-time evaluation CT

`LYR-CT0001`	a panic while evaluating at compile time	error
`LYR-CT0002`	a compile-time evaluation over its budget	error
`LYR-CT0003`	compile-time code that reaches outside the program	error
`LYR-CT0004`	an embed that cannot read its file	error
`LYR-CT0005`	a form that does not run at compile time yet	error
`LYR-CT0006`	a use of a declaration the build leaves out	error
`LYR-CT0007`	a macro expansion that does not end	error

Macros MAC

LYR-MAC0001 an error a macro reports error

The migration MIG

`LYR-MIG0001`	a program Lyric 4.6 refuses is not migrated	error
`LYR-MIG0002`	a lyric.json the migration cannot read	error
`LYR-MIG0101`	a module named otherwise by its header	hint
`LYR-MIG0102`	a native root without a counterpart	hint
`LYR-MIG0103`	a source root other than src/	hint
`LYR-MIG0104`	a toolchain line of Lyric 4	hint
`LYR-MIG0106`	declarations the whole package now sees	hint
`LYR-MIG0107`	a build script of Lyric 4	hint
`LYR-MIG0108`	tests compiled apart	hint
`LYR-MIG0110`	a file without an entry	hint
`LYR-MIG0205`	an opaque type became a struct	hint
`LYR-MIG0208`	a format spec without its old output	hint
`LYR-MIG0211`	a generic interface named by an associated type	hint
`LYR-MIG0301`	a written field became 'var'	hint
`LYR-MIG0302`	an equality or order with another type	hint
`LYR-MIG0303`	two operator results in one declaration	hint
`LYR-MIG0304`	a compare that returned an int	hint
`LYR-MIG0305`	a hash that returned an int	hint
`LYR-MIG0309`	arithmetic that may have meant to wrap	hint
`LYR-MIG0311`	a library function used as a value	hint
`LYR-MIG0312`	a string's length in characters	hint
`LYR-MIG0313`	an argument written twice	hint
`LYR-MIG0315`	an index that changed twice	hint
`LYR-MIG0318`	an array as a key	hint
`LYR-MIG0320`	a method that writes under an interface	hint
`LYR-MIG0321`	a written parameter	hint
`LYR-MIG0322`	an enum that holds itself	hint
`LYR-MIG0402`	an operation that answered whether it worked	hint
`LYR-MIG0408`	a try around all of main	hint
`LYR-MIG0409`	a close that a using says	hint
`LYR-MIG0501`	a task without a form	hint
`LYR-MIG0502`	tasks became a scope	hint
`LYR-MIG0601`	a library function without a form	hint
`LYR-MIG0602`	a library function that behaves otherwise	hint
`LYR-MIG0616`	a function bound to .NET	hint

Lowering IR

LYR-IR0001 a construct this compiler version could not lower error, retired

C generation CG

`LYR-CG0001`	a construct the C backend does not translate	error
`LYR-CG0002`	a compile-time-only function called at run time	error

Packages PKG

`LYR-PKG0001`	`lyric.toml` or `lyric.lock` is not valid TOML	error
`LYR-PKG0002`	a manifest or lock field that is missing or malformed	error
`LYR-PKG0003`	a key or section the manifest does not have	error
`LYR-PKG0004`	a dependency's source holds no package of that name	error
`LYR-PKG0005`	one package name read from two sources	error
`LYR-PKG0006`	a repository has no such revision or no package at it	error
`LYR-PKG0007`	a git dependency or a source tree cannot be read	error
`LYR-PKG0008`	the lock or a hash disagrees with what was read	error
`LYR-PKG0009`	a package asks for a newer toolchain	error
`LYR-PKG0010`	packages that depend on each other in a cycle	error
`LYR-PKG0011`	`--locked` and a lock that does not match	error
`LYR-PKG0012`	a dependency's build script the root does not trust	error

Building BLD

`LYR-BLD0001`	the C compiler or the linker failed	error
`LYR-BLD0002`	a package's build script did not build or did not succeed	error
`LYR-BLD0003`	a warning a build script reported	warning
`LYR-BLD0004`	a library of the machine cannot be had for this build	error
`LYR-BLD0005`	a module cannot be made from a C header	error
`LYR-BLD0006`	a file the build puts beside the binary is not there, shares its name, or would not be found there	error

Linking LNK

`LYR-LNK0001`	a C symbol nothing the link takes defines	error
`LYR-LNK0002`	a library the linker does not find	error
`LYR-LNK0003`	a C symbol two inputs of the link define	error

The command line CLI

`LYR-CLI0001`	a directory or file named on the command line does not exist	error
`LYR-CLI0002`	no C compiler was found	error
`LYR-CLI0003`	a command line the toolchain does not accept	error
`LYR-CLI0004`	no package here or above	error
`LYR-CLI0005`	a library has no program to run or print	error
`LYR-CLI0006`	the external runtime could not be started	error, retired
`LYR-CLI0007`	several programs and none named	error
`LYR-CLI0008`	a dependency `add` or `remove` cannot edit	error
`LYR-CLI0009`	the function named by `--function` is not in the module	error, retired
`LYR-CLI0010`	a `lyric.json` that cannot be understood	error, retired
`LYR-CLI0011`	no `build.lyr` in the directory a build was pointed at	error, retired
`LYR-CLI0012`	the build script ran and did not finish its job	error, retired
`LYR-CLI0013`	the stub was started without a program	error, retired
`LYR-CLI0014`	a packed executable is damaged	error, retired
`LYR-CLI0015`	no stub to pack into	error, retired
`LYR-CLI0016`	warnings under a profile that denies them	error, retired
`LYR-CLI0017`	a `lyric.json` holds something suspect	warning, retired
`LYR-CLI0018`	a `lyric.json` asks for a newer toolchain	error, retired
`LYR-CLI0019`	`--only` named an artifact the build script did not declare	error, retired
`LYR-CLI0020`	an internal failure of the 4.x compiler	error, retired
`LYR-CLI0021`	no package can be made here	error
`LYR-CLI0022`	the revision `lyric api --diff` names cannot be read	error
`LYR-CLI0023`	a toolchain cannot be fetched	error
`LYR-CLI0024`	a toolchain fetched is not what its index says	error
`LYR-CLI0025`	the installed toolchains refuse the change	error

Run time RT

`LYR-RT0001`	integer division by zero	panic
`LYR-RT0002`	integer overflow	panic
`LYR-RT0003`	an index or a range out of bounds	panic
`LYR-RT0004`	a null value unwrapped	panic
`LYR-RT0005`	out of memory	panic
`LYR-RT0006`	stack overflow	panic
`LYR-RT0007`	an argument that breaks a precondition	panic
`LYR-RT0008`	panic called by the program	panic
`LYR-RT0009`	a conversion to char of no Unicode scalar value	panic
`LYR-RT0010`	try! on an error	panic
`LYR-RT0011`	a failed assertion	panic
`LYR-RT0012`	unreachable reached	panic
`LYR-RT0013`	todo reached	panic
`LYR-RT0014`	a coroutine misused	panic
`LYR-RT0015`	the system refused the runtime what it needs	panic
`LYR-RT0016`	a collection changed while it was walked	panic
`LYR-RT0017`	control reached code the compiler holds unreachable	panic
`LYR-RT0018`	a deadlock	panic
`LYR-RT0019`	a lock poisoned by a panic	panic
`LYR-RT0020`	the runtime found its own invariant broken	panic
`LYR-RT0021`	an integer from C that no variant of the enum stands for	panic
`LYR-RT0022`	a Lyric function called from a thread Lyric does not run	panic
`LYR-RT0023`	a GcHandle that holds another class's object	panic

The toolchain itself ICE

`LYR-ICE0001`	the toolchain crashed	error
`LYR-ICE0002`	a construct the lowering cannot translate	error