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    Level

    source
    pub(all) enum Level {
      Hidden
      Displayed
      ErrorLevel
    } derive(Eq, 
    Debug    )

    What to do with a warning when it is reported.

    Policy

    source
    pub(all) struct Policy {
      level : (Warning) -> Level
    }

    A mapping from each warning to its level.

    A function rather than a table, so set returns an updated closure and later assignments naturally override earlier ones.

    Policy::resolve

    source
    fn Policy::resolve(self : Policy, w : Warning) -> Level

    Policy::set

    source
    fn Policy::set(self : Policy, target : String, level : Level) -> Result[Policy, String]

    policy updated so target -- a warning name, a group, or all -- has level. Later calls override earlier ones.

    Warning

    source
    pub(all) enum Warning {
      UnusedLocal
      UnusedField
      UnusedImport
      UnusedLabel
      UnnecessaryMut
      ShiftOverflow
      ConstantTrap
      TautologicalComparison
      ConstantCondition
      UnusedResult
      DeadCode
      CastAlwaysFails
      EagerSelect
      Precedence
      RedundantOperation
      TruncatedCoverage
      NamingConflict
      ReservedWordRename
      GeneratedName
      CompoundAssignment
      FieldPunning
      RedundantAnnotation
      ConfusableUnicode
    } derive(Eq, 
    Debug    )

    A named warning.

    Warning::description

    source
    fn Warning::description(self : Warning) -> String

    A one-line description, for help text.

    Warning::is_unnecessary

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    fn Warning::is_unnecessary(self : Warning) -> Bool

    Whether this flags code removable with no change in behaviour.

    An editor renders such a diagnostic faded -- LSP's DiagnosticTag.Unnecessary. Kept beside the definitions so every consumer classifies from one source.

    Warning::name

    source
    fn Warning::name(self : Warning) -> String

    The stable, hyphenated name.

    all

    source
    let all : Array[Warning]

    Every named warning.

    default_policy

    source
    let default_policy : Policy

    The level each warning has when nothing has configured it.

    The from-wasm renaming warnings are noisy round-trip notices, and redundant-operation and the suggestion group are optimisation and style hints common in generated code -- all hidden unless -W asks for them. Everything else is shown.

    groups

    source
    fn groups() -> Array[String]

    The group names, for help text. Excludes the special all.

    parse_spec

    source
    fn parse_spec(s : String) -> Result[(String, Level), String]

    Parse a -W argument, NAME=LEVEL.

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