http://d.puremagic.com/issues/show_bug.cgi?id=3507
Summary: [module] Flag unused imports to avoid unnecessary
dependencies
Product: D
Version: future
Platform: Other
OS/Version: All
Status: NEW
Keywords: diagnostic
Severity: enhancement
Priority: P2
Component: DMD
AssignedTo: nob...@puremagic.com
ReportedBy: llu...@gmail.com
--- Comment #0 from Leandro Lucarella <llu...@gmail.com> 2009-11-13 17:06:47
PST ---
Dependencies makes compile time increase in large projects and have other bad
impact in the code. An import might even execute code (module ctors), which can
make the program slower at *run-time* unnecessarily if the module is not really
used.
I think unused import should trigger *at least* an optional warning (with -w or
something) to aid the programmer in detecting unused modules. A way to tell the
compiler that an unused module is OK should be provided (in case we need the
module ctor to run), a possible syntax is a special renamed import:
import void = foo.bar.baz;
A special selective import can do the job too:
import foo.bar.baz: void;
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