Extract some import tests.

test/libsolidity/syntaxTests/imports/circular_import.sol

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+==== Source: a ====
+import "b"; contract C { D d; }
+==== Source: b ====
+import "a"; contract D { C c; }

test/libsolidity/syntaxTests/imports/complex_import.sol

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+==== Source: a ====
+contract A {} contract B {} contract C { struct S { uint a; } }
+==== Source: b ====
+import "a" as x; import {B as b, C as c, C} from "a";
+contract D is b { function f(c.S memory var1, x.C.S memory var2, C.S memory var3) internal {} }

test/libsolidity/syntaxTests/imports/filename_with_period.sol

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+==== Source: a/.b.sol ====
+contract B {}
+==== Source: a/a.sol ====
+import ".b.sol"; contract A is B {}
+// ----
+// ParserError: (a/a.sol:0-16): Source ".b.sol" not found: File not supplied initially.

test/libsolidity/syntaxTests/imports/import_does_not_clutter_importee.sol

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+==== Source: a ====
+contract C { D d; }
+==== Source: b ====
+import "a"; contract D is C {}
+// ----
+// DeclarationError: (a:13-14): Identifier not found or not unique.

test/libsolidity/syntaxTests/imports/import_is_transitive.sol

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+==== Source: a ====
+contract C { }
+==== Source: b ====
+import "a";
+==== Source: c ====
+import "b";
+contract D is C {}

test/libsolidity/syntaxTests/imports/inheritance_abi_encoder_match.sol

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+==== Source: A.sol ====
+pragma experimental ABIEncoderV2;
+
+contract A
+{
+    struct S { uint a; }
+    S public s;
+    function f(S memory _s) public returns (S memory,S memory) { }
+}
+==== Source: B.sol ====
+pragma experimental ABIEncoderV2;
+
+import "./A.sol";
+contract B is A { }
+==== Source: C.sol ====
+pragma experimental ABIEncoderV2;
+
+import "./B.sol";
+contract C is B { }
+// ----
+// Warning: (A.sol:0-33): Experimental features are turned on. Do not use experimental features on live deployments.
+// Warning: (B.sol:0-33): Experimental features are turned on. Do not use experimental features on live deployments.
+// Warning: (C.sol:0-33): Experimental features are turned on. Do not use experimental features on live deployments.

test/libsolidity/syntaxTests/imports/inheritance_abi_encoder_mismatch_1.sol

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+==== Source: A.sol ====
+pragma experimental ABIEncoderV2;
+
+contract A
+{
+    struct S { uint a; }
+    S public s;
+    function f(S memory _s) public returns (S memory,S memory) { }
+}
+==== Source: B.sol ====
+pragma experimental ABIEncoderV2;
+
+import "./A.sol";
+contract B is A { }
+==== Source: C.sol ====
+import "./B.sol";
+contract C is B { }
+// ----
+// Warning: (A.sol:0-33): Experimental features are turned on. Do not use experimental features on live deployments.
+// Warning: (B.sol:0-33): Experimental features are turned on. Do not use experimental features on live deployments.
+// TypeError: (C.sol:18-37): Contract "C" does not use the new experimental ABI encoder but wants to inherit from a contract which uses types that require it. Use "pragma experimental ABIEncoderV2;" for the inheriting contract as well to enable the feature.

test/libsolidity/syntaxTests/imports/inheritance_abi_encoder_mismatch_2.sol

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+==== Source: A.sol ====
+pragma experimental ABIEncoderV2;
+
+contract A
+{
+    struct S { uint a; }
+    S public s;
+    function f(S memory _s) public returns (S memory,S memory) { }
+}
+==== Source: B.sol ====
+import "./A.sol";
+contract B is A { }
+==== Source: C.sol ====
+import "./B.sol";
+contract C is B { }
+// ----
+// Warning: (A.sol:0-33): Experimental features are turned on. Do not use experimental features on live deployments.
+// TypeError: (B.sol:18-37): Contract "B" does not use the new experimental ABI encoder but wants to inherit from a contract which uses types that require it. Use "pragma experimental ABIEncoderV2;" for the inheriting contract as well to enable the feature.

test/libsolidity/syntaxTests/imports/library_name_clash.sol

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+==== Source: a ====
+library A {}
+==== Source: b ====
+library A {}
+==== Source: c ====
+import {A} from "./a"; import {A} from "./b";
+// ----
+// DeclarationError: (c:23-45): Identifier already declared.

test/libsolidity/syntaxTests/imports/library_name_clash_with_contract.sol

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+==== Source: a ====
+contract A {}
+==== Source: b ====
+library A {}

test/libsolidity/syntaxTests/imports/name_clash_in_import_1.sol

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+==== Source: a ====
+contract A {}
+==== Source: b ====
+import "a"; contract A {}
+// ----
+// DeclarationError: (b:12-25): Identifier already declared.

test/libsolidity/syntaxTests/imports/name_clash_in_import_2.sol

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+==== Source: a ====
+contract A {}
+==== Source: b ====
+import "a" as A; contract A {}
+// ----
+// DeclarationError: (b:17-30): Identifier already declared.

test/libsolidity/syntaxTests/imports/name_clash_in_import_3.sol

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+==== Source: a ====
+contract A {}
+==== Source: b ====
+import {A as b} from "a"; contract b {}
+// ----
+// DeclarationError: (b:26-39): Identifier already declared.

test/libsolidity/syntaxTests/imports/name_clash_in_import_4.sol

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+==== Source: a ====
+contract A {}
+==== Source: b ====
+import {A} from "a"; contract A {}
+// ----
+// DeclarationError: (b:21-34): Identifier already declared.

test/libsolidity/syntaxTests/imports/name_clash_in_import_5.sol

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+==== Source: a ====
+contract A {}
+==== Source: b ====
+import {A} from "a"; contract B {}

test/libsolidity/syntaxTests/imports/regular_import.sol

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+==== Source: a ====
+contract C {}
+==== Source: b ====
+import "a"; contract D is C {}

test/libsolidity/syntaxTests/imports/relative_import.sol

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+==== Source: a ====
+import "./dir/b"; contract A is B {}
+==== Source: dir/b ====
+contract B {}
+==== Source: dir/c ====
+import "../a"; contract C is A {}

test/libsolidity/syntaxTests/imports/relative_import_multiplex.sol

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+==== Source: a ====
+contract A {}
+==== Source: dir/a/b/c ====
+import "../../.././a"; contract B is A {}

test/libsolidity/syntaxTests/imports/shadowing_builtins_with_alias.sol

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+==== Source: B.sol ====
+contract C {}
+==== Source: b ====
+import {C as msg} from "B.sol";
+// ----
+// Warning: (B.sol:0-13): This declaration shadows a builtin symbol.

test/libsolidity/syntaxTests/imports/shadowing_builtins_with_imports.sol

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+==== Source: B.sol ====
+contract X {}
+==== Source: b ====
+import * as msg from "B.sol";
+contract C {
+}
+// ----
+// Warning: (b:0-29): This declaration shadows a builtin symbol.

test/libsolidity/syntaxTests/imports/shadowing_builtins_with_multiple_imports.sol

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+==== Source: B.sol ====
+contract msg {} contract block{}
+==== Source: b ====
+import {msg, block} from "B.sol";
+contract C {
+}
+// ----
+// Warning: (B.sol:0-15): This declaration shadows a builtin symbol.
+// Warning: (B.sol:16-32): This declaration shadows a builtin symbol.
+// Warning: (B.sol:0-15): This declaration shadows a builtin symbol.
+// Warning: (B.sol:16-32): This declaration shadows a builtin symbol.

test/libsolidity/syntaxTests/imports/shadowing_via_import.sol

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+==== Source: a ====
+library A {}
+==== Source: b ====
+library A {}
+==== Source: c ====
+import {A} from "./a"; import {A} from "./b";
+// ----
+// DeclarationError: (c:23-45): Identifier already declared.

test/libsolidity/syntaxTests/imports/simple_alias.sol

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+==== Source: a ====
+contract A {}
+==== Source: dir/a/b/c ====
+import "../../.././a" as x; contract B is x.A { function() external { x.A r = x.A(20); r; } }

test/libsolidity/syntaxTests/imports/smoke_test.sol

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+==== Source: a ====
+contract C {}