Add test case for #602 pull request fix.

[rluiten]

No description provided.

[eeue56]

@lukewestby @rluiten could one of you please update this PR with context from #602 ?

[eeue56]

@lukewestby @rluiten could one of you please update this PR with context from #602 ?

[lukewestby]

@eeue56 sure!

The primary occurrence of this issue is described in this thread from elm-dev. One of the tests in @rluiten's trie package is attempting to decode key-value pairs on something that is not an object. Instead of resulting in Err as expect, it's throwing a runtime error because the err function used on https://github.com/elm-lang/core/blob/master/src/Native/Json.js#L409 does not exist and should be badPrimitive instead. As of Sun May 15 2016 10:58:49 GMT-0500 (CDT) this PR is still waiting on rluiten#1 and will include both the fix and the test case covering this branch of runHelp in Native.Json once merged.

[lukewestby]

@eeue56 sure!

The primary occurrence of this issue is described in this thread from elm-dev. One of the tests in @rluiten's trie package is attempting to decode key-value pairs on something that is not an object. Instead of resulting in Err as expect, it's throwing a runtime error because the err function used on https://github.com/elm-lang/core/blob/master/src/Native/Json.js#L409 does not exist and should be badPrimitive instead. As of Sun May 15 2016 10:58:49 GMT-0500 (CDT) this PR is still waiting on rluiten#1 and will include both the fix and the test case covering this branch of runHelp in Native.Json once merged.

[eeue56]

@evancz ping (this is fairly important)

tl;dr -

Problem

• dict decoding can cause a runtime error

Solution

• err should be badPrimitive, this renames that
• add a test case to make sure dict decoding is more tested

[eeue56]

@evancz ping (this is fairly important)

tl;dr -

Problem

• dict decoding can cause a runtime error

Solution

• err should be badPrimitive, this renames that
• add a test case to make sure dict decoding is more tested