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Improved error message when an assocArray can't be created #7002

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May 11, 2019
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Improved error message when an assocArray can't be created #7002

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4 changes: 3 additions & 1 deletion std/array.d
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Original file line number Diff line number Diff line change
Expand Up @@ -442,7 +442,8 @@ if (isInputRange!Range)
import std.typecons : isTuple;

alias E = ElementType!Range;
static assert(isTuple!E, "assocArray: argument must be a range of tuples");
static assert(isTuple!E, "assocArray: argument must be a range of tuples,"
~" but was a range of "~E.stringof);
static assert(E.length == 2, "assocArray: tuple dimension must be 2");
alias KeyType = E.Types[0];
alias ValueType = E.Types[1];
Expand Down Expand Up @@ -552,6 +553,7 @@ if (isInputRange!Values && isInputRange!Keys)
@safe unittest
{
import std.typecons;
static assert(!__traits(compiles, [ 1, 2, 3 ].assocArray()));
static assert(!__traits(compiles, [ tuple("foo", "bar", "baz") ].assocArray()));
static assert(!__traits(compiles, [ tuple("foo") ].assocArray()));
assert([ tuple("foo", "bar") ].assocArray() == ["foo": "bar"]);
Expand Down