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1; 10; 999; 0; 00; 000; 08; 019
1_; 1_0; 9_9__9; 0; 0_0; 0_0_0__; 0__8; 01_9
0b0; 0b11; 0b000; 0b010; 0b01011
0b0_; 0b1_1; 0b0_00; 0b01_0; 0b01__0_1__1_
0o77; 0o0; 0o01; 0o777; 0o644
0o7_7_; 0o0; 0o0_1; 0o77__7; 0o6_44__
0x0; 0xa0; 0x7FFF; 0xd3aD
0x0_; 0xa__0; 0x7F_FF; 0xd3_aD__
4.2; 4.20; 88.0; 13.37
4.2_; 4.2__0; 8_8.0; 13_.3_7__
0e10; 0.00e+10; 9e-10; 4.2E10; 40.0E+10; 0e100; 1010e+10
0e1_0; 0.0__0e+1_0; 9_e-1__0_; 4.2_E1_0; 4_0_.0E+1_0; 0e1_0_0; 10_10e+10_
0x0p0; 0x1.ep6; 0xa0p+01; 0x0.7FFp-18; 0xd3aD.B00p9
0x0_P0_; 0x1__.Ep6; 0xa_0p+0__1; 0x0.7__F_F_P-1__8_; 0xd__3_aD.b00__p9
// expressions containing numeric literals
+0
+-1
2-3
-10.magnitude
fn(-5)
0x2.p2
// expressions not containing numeric literals
fn(x0.d);
// pseudo-expressions containing numeric literals
.0
0.
// invalid pseudo-numeric expressions
_0
0b_0
0b02
0B0
0o_0
0o08
0O7
0x_0
0x0G
0X0
1e_1
0b1e1
0o1e1
0x0pA
0x.1p1
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