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authorBjörn Gustavsson <[email protected]>2015-01-27 06:49:52 +0100
committerBjörn Gustavsson <[email protected]>2015-01-28 09:48:39 +0100
commit11dcd4774a6beb28306b9e6e1b80b00d9596bf5f (patch)
tree3efd898883f790989528492916c4976bb266ecdb /erts
parent81d728c44774a4e0367b30d377ac9f136ecf853e (diff)
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sys_core_fold: Remove uncovered clauses matching #c_map{}
sys_core_fold:eval_element/3 attempts to evaluate calls to element/2 at compile time or to warn when the call will obviously fail. For example: element(1, [a]) will obviously fail and eval_element/3 will produce a warning. eval_element/3 uses the helper functions is_not_integer/1 and is_not_tuple/1 to test whether the arguments are known to be incorrect. The clauses that attempt to match #c_map{} in those helper function will never be executed, because #c_map{} will never occur directly in an argument for a function call. For example, code such as: element(1, #{a=>Val}) will be translated to: let <NewVar> = #{a=>Val} in element(1, NewVar) since maps are not considered safe (some map operations may cause an exception at run time).
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