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Fix some situations with duplicate imports (#589)

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* Fix importing the same identifier from two modules

This needed a fix in two locations:

* First the generated descriptor function needed its hash to include the module
  that the import came from in order to generate unique descriptor functions.
* Second the generation of the JS shim needed to handle duplicate identifiers in
  a more uniform fashion, ensuring that imported names didn't clash.

* Fix importing the same name in two modules

Previously two descriptor functions with duplicate symbols were emitted, and now
only one function is emitted by using a global table to keep track of state
across macro invocations.
This commit is contained in:
Alex Crichton
2018-07-30 10:50:43 -07:00
committed by GitHub
parent 7fda07f797
commit d876475ce3
8 changed files with 241 additions and 85 deletions
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crates/backend/Cargo.toml
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@ -15,6 +15,7 @@ spans = ["proc-macro2/nightly"]
extra-traits = ["syn/extra-traits"]
[dependencies]
lazy_static = "1.0.0"
log = "0.4"
proc-macro2 = "0.4.8"
quote = '0.6'