Bug 22432 – ImportC: casting result of postfix operator on a parenthesized expression to a typedef’d type is parsed incorrectly

The following c program fails to compile: // test.c struct Foo { int x; }; typedef int int32_t; void foo(void){ struct Foo f = {1}; int x0 = ((int)(f).x); int x1 = (int)(f).x; int32_t x2 = (int32_t)(f).x; // Error int32_t x3 = ((int32_t)(f).x); // Error int32_t x4 = (int32_t)f.x; } // test.c(11): Error: `=`, `;` or `,` expected // test.c(12): Error: found `.` when expecting `)` // test.c(12): Error: missing comma // test.c(12): Error: `=`, `;` or `,` expected Works with builtin types, fails with typedef’d types.

Some more examples: int ints[] = {1,2,3,4}; int y0 = ints[0]; int y1 = (int)ints[0]; // ok int y2 = (int)(ints)[0]; // ok int y3 = (int32_t)ints[0]; // ok int y4 = (int32_t)(ints)[0]; // Error int y5 = (int)y4++; // ok int y6 = (int)(y4)++; // Error int y7 = (int32_t)y4++; // ok int y8 = (int32_t)(y4)++; // Error It looks like postfix expressions aren’t properly being considered for cast expressions.

(In reply to dave287091 from comment #1) > Some more examples: > > int ints[] = {1,2,3,4}; > int y0 = ints[0]; > int y1 = (int)ints[0]; // ok > int y2 = (int)(ints)[0]; // ok > int y3 = (int32_t)ints[0]; // ok > int y4 = (int32_t)(ints)[0]; // Error > int y5 = (int)y4++; // ok > int y6 = (int)(y4)++; // Error > int y7 = (int32_t)y4++; // ok > int y8 = (int32_t)(y4)++; // Error > > It looks like postfix expressions aren’t properly being considered for cast > expressions. Another one: int y4b = (int32_t)(ints+1)[0]; // Error I’m guessing using `->` would also fail but I didn’t test it.

Another weird construct that should parse, but fails: struct Foo { int x; }; struct Foo ident(struct Foo f){return f;} int main(){ int y11 = (ident)(f).x; // should be equivalent to ident(f).x }

@WalterBright created dlang/dmd pull request #13299 "fix Issue 22432 - ImportC: casting result of postfix operator on a pa…" fixing this issue: - fix Issue 22432 - ImportC: casting result of postfix operator on a parenthesized expression to a typedef.d type is parsed incorrectly https://github.com/dlang/dmd/pull/13299

dlang/dmd pull request #13299 "fix Issue 22432 - ImportC: casting result of postfix operator on a pa…" was merged into stable: - 43bdfcf765551cb772d9dbf0fe75a13fdbaa78b0 by Walter Bright: fix Issue 22432 - ImportC: casting result of postfix operator on a parenthesized expression to a typedef.d type is parsed incorrectly https://github.com/dlang/dmd/pull/13299

dlang/dmd pull request #13421 "merge stable" was merged into master: - f6cb3ed3e340ac37b87d1f58dbfa5ba45aba7f92 by Walter Bright: fix Issue 22432 - ImportC: casting result of postfix operator on a parenthesized expression to a typedef.d type is parsed incorrectly https://github.com/dlang/dmd/pull/13421