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This commit expands the DriverMessage type with new type constructors,
making the number of diagnostics GHC can emit richer. In particular:
* Add DriverMissingHomeModules message
* Add DriverUnusedPackage message
* Add DriverUnnecessarySourceImports message
This commit adds the `DriverUnnecessarySourceImports` message and
fixes a small bug in its reporting: inside
`warnUnnecessarySourceImports` we were checking for
`Opt_WarnUnusedSourceImports` to be set, but we were emitting the
diagnostic with `WarningWithoutFlag`. This also adjusts the T10637 test to reflect that.
* Add DriverDuplicatedModuleDeclaration message
* Add DriverModuleNotFound message
* Add DriverFileModuleNameMismatch message
* Add DriverUnexpectedSignature message
* Add DriverFileNotFound message
* Add DriverStaticPointersNotSupported message
* Add DriverBackpackModuleNotFound message
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1. `text` is as efficient as `ptext . sLit` thanks to the rewrite rules
2. `text` is visually nicer than `ptext . sLit`
3. `ptext . sLit` encourages using one `ptext` for several `sLit` as in:
ptext $ case xy of
... -> sLit ...
... -> sLit ...
which may allocate SDoc's TextBeside constructors at runtime instead
of sharing them into CAFs.
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This commit moves the error-related functions in `GHC.Iface.Load` into
a brand new module called `GHC.Iface.Errors`. This will avoid boot files
and circular dependencies in the context of #18516, in the
pretty-printing modules.
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